|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | Filed      Pursuant to Rule 424(b)(3)                                               |   |
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|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | Registration      No. 333-124310                                                    |   |
| PRICING      SUPPLEMENT NO. 426                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |                                                                                |
| Dated      March 19, 2008 to                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |                                                                                |   |
| PROSPECTUS      SUPPLEMENT                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |                                                                                |
| Dated      June 8, 2005 and                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |                                                                                |   |
| PROSPECTUS                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |                                                                                |   |
| Dated      May 13, 2005                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |                                                                                |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |                                                                                |   |
| CATERPILLAR      FINANCIAL SERVICES CORPORATION                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |                                                                                |
| MEDIUM-TERM      NOTES, SERIES F, 5.45% NOTES DUE 2018                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |                                                                                |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |                                                                                |   |
| SUBJECT                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | FINAL PRICING DETAILS                                                               |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |                                                                                |   |
| Issuer:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | Caterpillar      Financial Services Corporation                                     |   |
| Title      of Securities:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | Medium-Term      Notes, Series F, 5.45% Notes Due 2018                              |
| Ratings:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | A2/A                                                                                |   |
| Format:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | SEC      Registered-Registration Statement Number 333-124310                        |
| Trade      Date/Pricing Effective Time:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | March      19, 2008                                                                 |   |
| Settlement      Date (Original Issue date):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | March      27, 2008                                                                 |   |
| Maturity      Date:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | April      15, 2018                                                                 |   |
| Principal      Amount:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | $750,000,000                                                                        |   |
| Price      to Public (Issue Price):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | 99.751%                                                                             |   |
| Dealers'      Commission:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 0.475%      (47.5 basis points)                                                     |   |
| All-in-price:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | 99.276%                                                                             |   |
| Net      Proceeds to Issuer:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | $744,570,000                                                                        |   |
| Coupon                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | 5.450%                                                                              |   |
| Yield      to Maturity                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | 5.482%                                                                              |   |
| Spread      Multiplier:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | N/A                                                                                 |   |
| Spread/Spread      Multiplier Reset Option:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | N/A                                                                                 |   |
| Optional      Reset Dates (only applicable if option to reset spread or spread      multiplier):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | N/A                                                                                 |   |
| Basis      for Interest Rate Reset (only applicable if option to reset spread or      spread multiplier):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | N/A                                                                                 |   |
| Specified      Currency:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | U.S.      Dollars                                                                   |   |
| Option      to Elect Payment in U.S. Dollars  (only applicable if Specified      Currency is other than U.S. Dollars):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | N/A                                                                                 |   |
| Authorized      Denominations (only applicable if Specified Currency is other than U.S.      Dollars):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | N/A                                                                                 |   |
| Historical      Exchange Rate (only applicable if Specified Currency is other than U.S.      Dollars):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | N/A                                                                                 |   |
| Maximum      Interest Rate:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | N/A                                                                                 |   |
| Minimum      Interest Rate:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | N/A                                                                                 |   |
| Interest      Payment Dates:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | Interest      will be paid semi-annually on the 15th of April and  October          |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | of      each year, commencing October 15, 2008 and ending on the Maturity      Date |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |                                                                                |   |
| Stated      Maturity Extension Option:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | N/A                                                                                 |   |
| Extension      Period(s) and Final Maturity Date (only applicable if option to extend      stated maturity):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | N/A                                                                                 |   |
| Basis      for Interest Rate During Extension Period (only applicable if option to      extend stated maturity):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | N/A                                                                                 |   |
| Original      Issue Discount Note:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | N/A                                                                                 |   |
| Total      Amount of OID:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | N/A                                                                                 |   |
| Terms      of Amortizing Notes:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | N/A                                                                                 |   |
| Redemption      Date(s):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | N/A                                                                                 |   |
| Redemption      Price:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | N/A                                                                                 |   |
| Repayment      Date(s):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | N/A                                                                                 |   |
| Repayment      Price(s):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | N/A                                                                                 |   |
| Day      Count Convention:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | 30/360                                                                              |   |
| Denominations:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | Minimum      denominations of $1,000 with increments of $1,000    thereafter        |
| Joint      Lead Manager & Bookrunner:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | J.P.      Morgan Securities Inc. (Billing and Delivering -28.34%)                   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | Barclays      Capital Inc. (28.33%)                                                 |   |
| Joint      Lead Manager:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | Citigroup      Global Markets Inc. (28.33%)                                         |   |
| Co-Manager:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | Merrill      Lynch, Pierce, Fenner & Smith (7.5%)                               |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | TD      Securities (USA) LLC (7.5%)                                                 |   |
| Exchange      Rate Agent:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | U.S.      Bank Trust National Association                                           |   |
| Calculation      Agent:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | U.S.      Bank Trust National Association                                           |   |
| CUSIP:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | 14912L3U3                                                                           |   |
| Other      Terms:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | N/A                                                                                 |   |
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| CAPITALIZED      TERMS USED HEREIN WHICH ARE DEFINED IN THE PROSPECTUS SUPPLEMENT SHALL      HAVE THE MEANINGS ASCRIBED THERETO IN THE PROSPECTUS SUPPLEMENT. THE      INTEREST RATES ON THE NOTES MAY BE CHANGED BY CATERPILLAR FINANCIAL      SERVICES CORPORATION FROM TIME TO TIME, BUT ANY SUCH CHANGE WILL NOT      AFFECT THE INTEREST RATE ON ANY NOTES OFFERED PRIOR TO THE EFFECTIVE DATE      OF THE CHANGE. AFTER THE ISSUANCE OF THE NOTES COVERED BY THIS PRICING      SUPPLEMENT, $550MM PRINCIPAL AMOUNT OF NOTES REMAIN AVAILABLE FOR SALE      PURSUANT TO THE ACCOMPANYING PROSPECTUS  SUPPLEMENT. |