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                                                                   Exhibit 10.24

                       PERFORMANCE STOCK OPTION AGREEMENT

      This Stock Option Agreement, dated as of the Grant Date set forth on
Schedule A hereto, between Dresser-Rand Group Inc., a Delaware corporation (the
"Company"), and the grantee whose name appears on Schedule A (the "Grantee"), is
being entered into pursuant to the Dresser-Rand Group Inc. 2005 Stock Incentive
Plan (the "Plan"). Capitalized terms used herein without definition have the
meaning given in the Plan.

      1. Grant of Options.

      (a) Confirmation of Grant. The Company hereby evidences and confirms its
grant to the Grantee, effective as of the Grant Date set forth on Schedule A, of
the five separate tranches of NSOs (the "Options") to purchase the number of
Shares set forth on Schedule A. The Options are subject to the terms of the
Plan, which terms are incorporated by reference herein. If there is any
inconsistency between the terms hereof and the terms of the Plan, the terms of
the Plan shall govern.

      (b) Exercise Price. The Options shall have an exercise price of $21.00 per
share, subject to adjustment as provided in the Plan (the "Exercise Price").

      2. Vesting and Exercisability.

      (a) Definitions. For purposes of this Section 2, the following terms have
the meanings set forth below:


      "Exit Event" means the closing of any transaction where First Reserve
receives cash, cash equivalents or marketable publicly-traded securities on or
with respect to the First Reserve Investment.

      "Exit Value" means the aggregate dollar amount received by First Reserve
in any Exit Event, whether such Exit Event occurs before or after the date of
this Agreement. "Exit Value" shall be a cumulative number, such that the Exit
Value resulting from any prior Exit Events shall be added to the Exit Value
obtained in the current Exit Event in order to determine the Exit Value
following any Exit Event.

      "First Reserve Investment" means the aggregate dollar amount of all
indirect equity investments in the Company made by First Reserve, whether such
investments occur before or after the date of this Agreement.

      (b) Operative Provisions. Subject to the Grantee's continuous employment
with the Company or a Subsidiary until the time of the applicable Exit Event,
each tranche of Options shall vest and become exercisable on the date of an Exit
Event if and
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only if the Exit Value after the Exit Event equals or exceeds the First Reserve
Investment multiple set forth opposite such tranche in the following table:

<TABLE>
<CAPTION>
          Tranche of Options         Minimum Exit Value Required for Vesting
          ------------------         ---------------------------------------
<S>                                  <C>
                  A                     2.25x the First Reserve Investment

                  B                     2.50x the First Reserve Investment

                  C                     2.75x the First Reserve Investment

                  D                     3.00x the First Reserve Investment

                  E                     3.25x the First Reserve Investment
</TABLE>

      3. Termination of the Options.

      (a) Normal Termination Date. Unless earlier terminated pursuant to Section
3(b), the Options shall terminate and be canceled on the tenth anniversary of
the Grant Date (the "Normal Termination Date").

      (b) Early Termination.

            (i) Unvested Options. Any Options that are not vested and
      exercisable on the date of the Grantee's termination of employment, or
      that do not become vested and exercisable in connection with a Change in
      Control or following an Exit Event where the dollar amount of the First
      Reserve Investment is reduced to zero, shall be immediately forfeited and
      canceled.

            (ii) Vested Options. Any Options that are vested and exercisable on
      the date of the Grantee's termination of employment shall remain
      exercisable until the first to occur of (A) the 90th day following the
      date of the Grantee's termination of employment (the 365th day in the case
      of terminations of employment by reason of death or Disability) and (B)
      the Normal Termination


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      Date, and if not exercised within such period the Options shall
      automatically terminate and be canceled upon the expiration of such
      period.

            (iii) Terminations for Cause. Notwithstanding anything in this
      Agreement to the contrary, if the Grantee's employment is terminated for
      Cause, all Options, whether or not then vested and exercisable, shall be
      immediately forfeited and canceled as of the date of such termination of
      employment.

      4. Manner of Exercise. The Grantee may exercise any Options that have
become vested and exercisable by providing written notice of exercise to the
Company and paying the aggregate Exercise Price for such Options (i) in cash or
its equivalent, (ii) by exchanging Shares that are not the subject of any pledge
or other security interest, (iii) through an arrangement with a broker approved
by the Company whereby payment is accomplished in whole or in part with the
proceeds of the sale of Shares or (iv) by any combination of the forgoing.

      5. Miscellaneous.

      (a) Tax Withholding. No Shares shall be issued pursuant to the exercise of
Options unless and until the Grantee has made arrangements satisfactory to the
Committee to satisfy applicable withholding tax obligations.

      (b) Binding Effect; Benefits. This Agreement shall be binding upon and
inure to the benefit of the parties to this Agreement and their respective
successors and assigns. Nothing in this Agreement, express or implied, is
intended or shall be construed to give any person other than the parties to this
Agreement or their respective successors or assigns any legal or equitable
right, remedy or claim under or in respect of any agreement or any provision
contained herein.

      (c) Amendment. This Agreement may not be amended, modified or supplemented
orally, but only by a written instrument executed by both the Grantee and the
Company.

      (d) Assignability. Neither this Agreement nor any right, remedy,
obligation or liability arising hereunder or by reason hereof shall be
assignable by the Company or the Grantee without the prior written consent of
the other party, provided that the Company may assign all or any portion of its
rights or obligations under this Agreement to one or more persons or other
entities designated by it.

      (e) APPLICABLE LAW. THIS AGREEMENT SHALL BE CONSTRUED IN ACCORDANCE WITH
AND GOVERNED BY THE LAWS OF THE STATE OF DELAWARE, WITHOUT REFERENCE TO
PRINCIPLES OF CONFLICT OF LAWS WHICH WOULD REQUIRE APPLICATION OF THE LAW OF
ANOTHER JURISDICTION.


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      (f) Severability; Blue Pencil. In the event that any one or more of the
provisions of this Agreement shall be or become invalid, illegal or
unenforceable in any respect, the validity, legality and enforceability of the
remaining provisions contained herein shall not be affected thereby.

      (g) Section and Other Headings. The section and other headings contained
in this Agreement are for reference purposes only and shall not affect the
meaning or interpretation of this Agreement.

      (h) Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall be deemed to be an original and all of which
together shall constitute one and the same instrument.


                          -- Signature page follows --


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         IN WITNESS WHEREOF, the Company and the Grantee have executed this
Agreement as of the Grant Date.

                                       DRESSER-RAND GROUP INC.



                                       By: /s/ Elizabeth C. Powers
                                           --------------------------------
                                           Name:  Elizabeth C. Powers
                                           Title: Vice President and
                                                  Chief Administrative Officer




                                       GRANTEE



                                        /s/ Lonnie Arnett
                                        ----------------------------------
                                            Lonnie Arnett


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