EXHIBIT 2.5.8

                                    AGREEMENT

THIS AGREEMENT (the "Agreement") is dated as of the 8th day of January, 1999
(the "Effective Date") by and between Able Telcom Holding Corp. (the "Company")
and WorldCom Network Services, Inc. (the "WorldCom"). (The Company and WorldCom
are sometimes individually referred to as a "Party" and collectively as the
"Parties").

                                    RECITALS

A.       Pursuant to the terms of the September 9, 1998 Agreement (the
"September Agreement") between the Company and WorldCom, the Company agreed that
it will grant to WorldCom certain stock appreciation or other rights (the
"SARs") whereby WorldCom shall have the right to participate in an increase in
the value of the Company's common stock, par value $.001 (the "Common Stock").

B.       The Parties acknowledge that certain agreements of the Company with
other third parties may restrict the ability of the Company to issue equity
securities and/or other rights relating to the Company's capital stock (a
"Restrictive Agreement"), which Restrictive Agreements include (i) a Credit
Agreement dated June 11, 1998, as amended, with the Company's senior lenders
(the "Credit Agreement") and (ii) a Stock Purchase Agreement dated June 26, 1998
("Purchase Agreement") with certain purchasers of the Company's Series B
Convertible Preferred Stock.

C.       The Parties intend that the SARs shall be issued promptly after the
"Conditions to Issuance," as defined in Section 2.b. below, are satisfied.

NOW, THEREFORE, in consideration of the mutual covenants set forth herein, and
other good and valuable consideration, the receipt and adequacy of which is
hereby acknowledged thereof, the parties hereto agree as follows:

1.       INCORPORATION BY REFERENCE. The above recitals are true, correct and
are incorporated herein by reference.

2.       CONDITIONS TO ISSUANCE.

         a. The Company shall issue to WorldCom a Stock Appreciation Agreement
("SAR Agreement") in substantially the form attached hereto as Exhibit "A"
promptly upon the satisfaction of the Conditions to Issuance as set forth in
Section 2.b. below; provided that to the extent (i) that the issuance of such
SAR Agreement would otherwise cause a default in connection with any agreement
or arrangement with any other third parties, including any of the Restrictive
Agreements, or (ii) if the Conditions to Issuance have not been satisfied on or
before February 28, 1999, then in either of such events the Parties shall use
their respective good faith efforts to agree upon such modifications to the
terms of the SAR Agreement so that such SAR Agreement would not cause such a
default or require a consent from a third party.

<PAGE>

         b. Unless waived by the Company, the Conditions to Issuance are as
follows:

                  i. Although the Company does not believe that the issuance of
the SAR Agreement is restricted by the terms of the Purchase Agreement because
the SARs granted thereunder do not constitute equity securities or instruments
convertible or exercisable for equity securities, the SAR Agreement will
nonetheless not be issued until the restriction on the issuance of equity
securities set forth in Section 3.13(a) of the Purchase Agreement (which
restriction in pertinent part, provides that no equity securities will be issued
by the Company until the "Registration Statement" has been declared effective by
the "SEC" and the "Common Shares" are subject to "Effective Registration" (as
such terms are defined in the Purchase Agreement)) is satisfied; and

                  ii. The Company shall have obtained the consent or waiver of
the senior lenders under the Credit Agreement to issue the SARs pursuant to the
SAR Agreement.

3.       FURTHER ASSURANCES. The Parties hereby agree from time to time to 
execute and deliver such further and other transfers, assignments and documents
and do all matters and things which may be convenient or necessary to more
effectively and completely carry out the intentions of this Agreement.

4.       BINDING EFFECT. All of the terms and provisions of this Agreement, 
whether so expressed or not, shall be binding upon, inure to the benefit of, and
be enforceable by the Parties and their respective administrators, executors,
legal representatives, heirs, successors and permitted assigns.

5.       GOVERNING LAW. This Agreement and all transactions contemplated by this
Agreement shall be governed by, and construed and enforced in accordance with,
the internal laws of the State of Florida without regard to principles of
conflicts of laws.

6.       ENTIRE AGREEMENT. This Agreement represents the entire understanding 
and agreement among the Parties with respect to the subject matter hereof, and
supersedes all other negotiations, understandings and representations (if any)
made by and among such Parties.

                [REMAINDER OF THIS PAGE LEFT INTENTIONALLY BLANK]

<PAGE>


IN WITNESS WHEREOF, the undersigned have executed this Agreement as of the date
first above written.

                                       THE COMPANY:

                                       ABLE TELCOM HOLDING CORP.

                                       By: /s/ BILLY V. RAY, JR.
                                           -----------------------------------
                                       Name: BILLY V. RAY, JR.
                                             ---------------------------------
                                       Its: CEO and PRESIDENT
                                            ----------------------------------

                                       WORLDCOM:

                                       WORLDCOM NETWORK SERVICES, INC.

                                       By: /s/ DAVID E. MEYERS
                                           -----------------------------------
                                       Name: DAVID E. MEYERS
                                             ---------------------------------
                                       Its: VP and CONTROLLER
                                            ----------------------------------

<PAGE>


                                    EXHIBIT A

                       STOCK APPRECIATION RIGHTS AGREEMENT

         THIS STOCK APPRECIATION RIGHTS AGREEMENT (the "SAR Agreement") is
effective as of the ___ day of _______, ____ (the "Issue Date") by and between
Able Telcom Holding Corp., a Florida corporation (the "Company") and WorldCom
Network Services, Inc. (the "Optionee").

                                    RECITALS

A.       Pursuant to the terms of the September 9, 1998, Agreement (the 
"September Agreement") between the Company and the Optionee, the Company agreed
that it will grant to the Optionee certain Stock Appreciation Rights whereby the
Optionee shall have the right to participate in an increase in the value of the
Company's common stock, par value $.001 (the "Common Stock") (individually as to
an increase in value for each share of Common Stock, an "SAR" and collectively
"SARs"); and

B.       Optionee and the Company desire to establish the terms and conditions 
of such SARs in this SAR Agreement;

NOW, THEREFORE, in consideration of the mutual covenants set forth herein, and
other good and valuable consideration, the receipt and adequacy of which is
hereby acknowledged thereof, the parties hereto agree as follows:

1.       RECITALS.  The above recitals are true, correct, and are incorporated 
herein by reference.

2.       GRANT OF SARS. Subject to and upon the terms and conditions set forth 
in this SAR Agreement, the Company hereby grants and issues to Optionee, as of
the Issue Date, the right to participate in an increase in the value of an
aggregate of Six Hundred Thousand (600,000) shares of Common Stock (the
"Aggregate Base Common Stock"). Each SAR shall represent the right to
participate in an increase in the value of one (1) share of Common Stock. The
Optionee shall be entitled to receive, for each SAR exercised, an amount payable
in cash, Common Stock, or a combination thereof, at the Company's election (as
hereinafter provided), equal to the excess of the "Fair Market Value", as
hereinafter defined, of the Common Stock over $5-3/32, as of the applicable
"Exercise Day(s)", as hereinafter defined; and provided that in no event shall
the maximum amount payable hereunder, whether in cash, Common Stock or a
combination thereof, exceed $25.00 per SAR. Without limiting the generality of
the foregoing, it is the intent of the parties that Optionee shall not share in
any appreciation in the Fair Market Value of the Common Stock over $30-3/32 per
share. The foregoing $5-3/32 and $30-3/32 figures are sometimes referred to
herein as the "Collar Prices." For purposes of this SAR Agreement, "Fair Market
Value" shall mean the average in the last three (3) trading days immediately
preceding the applicable Exercise Day of (i) the last closing bid price for the
Common Stock on the Nasdaq National Market ("NASDAQ"), as reported by Bloomberg
Financial Markets or its successors

<PAGE>


("Bloomberg") or, (ii) if NASDAQ is not the principal trading market for the
Common Stock, the last closing bid price of the Common Stock on the principal
securities exchange or trading market where the Common Stock is listed or traded
as reported by Bloomberg, or (iii) if the foregoing do not apply, the last
closing bid price of the Common Stock in the over-the-counter market on the
electronic bulletin board for the Common Stock reported by Bloomberg, or (iv) if
no closing bid price is reported for the Common Stock by Bloomberg, the last
closing trade price of the Common Stock by Bloomberg, or (v) if no closing bid
price is reported for the Common Stock by Bloomberg, the average of the bid
prices of any market makers for the Common Stock as reported in the "pink
sheets" by the National Quotation Bureau, Inc.

3.       SPECIFIED TERM; TIME OF EXERCISE. The SARs shall vest as of the Issue 
Date and shall be exercisable, in whole or in part, at the times and in the
manner specified by Section 6.A. below solely with respect to the following
days: (i) July 2, 1999, (ii) July 2, 2000, or (iii) July 2, 2001 (each an
"Exercise Day" and collectively "Exercise Days"); provided that the
determination of the Fair Market Value shall be determined only for the amount
of SARs being exercised on such Exercise Day. All rights with respect to any
unexercised SARs shall expire, and these SARs shall become null and void at 5:00
on July 7, 2001, or as otherwise provided in Section 4.B. hereof.

4.       CERTAIN ADJUSTMENTS.

         A. In the event of any change in the capital structure or business of
the Company by reason of any stock dividend or extraordinary dividend, stock
split or reverse stock split, recapitalization or reclassification of its
capital stock, or any similar change affecting the Company's capital structure
and the Company determines an adjustment is appropriate under this SAR
Agreement, then the aggregate number and kind of shares which thereafter may be
issued under this SAR Agreement, the number and kind of shares or other property
(including cash) to be issued upon exercise of an outstanding SAR granted under
this SAR Agreement, the number of shares constituting the Aggregate Base Common
Stock, and the Collar Prices thereof shall be appropriately adjusted consistent
with such change.

         B. In the event of a merger or consolidation in which the Company is
not the surviving entity or in the event of any transaction that results in the
acquisition of all or substantially all of the Company's outstanding Common
Stock by a single person or entity or by a group of persons and/or entities
acting in concert, or in the event of the sale or transfer of all or
substantially all of the Company's assets (all of the foregoing being referred
to as "Acquisition Events"), then the Company may, in its sole discretion,
terminate all outstanding SARs, effective as of the date of the Acquisition
Event, by delivering notice of termination to each such Participant at least
thirty (30) days prior to the date of consummation of the Acquisition Event;
provided, that during the period from the date on which such notice of
termination is delivered to the consummation of the Acquisition Event, the
Optionee shall have the right to exercise in full, subject to the limitations in
Section 2, all of the SARs that are then outstanding as of the date immediately
preceding the date of the Acquisition Event (such date to be an additional
Exercise Day within the meaning of this SAR Agreement) but contingent on the
occurrence of the Acquisition Event, and further provided that, if the
Acquisition Event does not take place within a specified period after giving
such notice for any reason whatsoever, the notice and exercise shall be null and
void.

                                        2

<PAGE>


5.       PRIVILEGE OF STOCK OWNERSHIP. Optionee shall not be deemed to be the 
holder of, or to have any of the rights of a holder of Common Stock with respect
to, any SARs.

6.       MANNER OF EXERCISING SARS.

         A. The SARs may be exercised in whole or in part, only by written
notice signed by Optionee and mailed or delivered to the President or Secretary
of the Company at its principal office, within five (5) days following any
Exercise Day that the Optionee shall have elected to exercise any or all of its
SARs, which notice shall: (i) specify the number of SARs which are being
exercised; (ii) the federal identification number of the Optionee (or
transferee); and (iii) if the Option is being exercised by any party or parties
other than Optionee, be accompanied by proof satisfactory to the Company and its
counsel, that such party or parties have the right to exercise the Option and
(iv) such other documentation and representations as may be reasonably requested
by the Company in connection with such exercise. Once exercised a particular SAR
may not be further exercised.

         B. This Option shall be deemed to have been exercised with respect to
the SARs specified in said notice at the time of timely receipt by the Company
of the notice specified in Section 5(A) hereof.

         C. Upon receipt of such notice, the Company shall have up to thirty
(30) days to pay the Optionee the value of any SARs so exercised. Such payment
may, at the Company's election, be either in (i) cash or other immediately
available funds; (ii) shares of Common Stock; or (iii) a combination thereof. To
the extent that the Company elects to make any or all payments in the form of
Common Stock, such shares of Common Stock shall be valued for purposes of this
SAR Agreement, at the Fair Market Value of the Common Stock as of the
corresponding Exercise Day for which Optionee has exercised such SARs. To the
extent the shares of Common Stock are not then registered pursuant to the
Securities Act of 1933, as amended (the "Act"), the Optionee acknowledges and
agrees that it shall make such representations and warranties that the Company
may reasonable request to support an exemption pursuant to Section 4(2) of such
Act, including with respect to Optionee's investment intent, accredited investor
status and restrictions on transfer.

         D. Notwithstanding anything to the contrary contained in this Agreement
and specifically in Section 6.C., the parties to this Agreement acknowledge and
agree that to the extent that the Company elects to make payments described in
this Agreement to the Optionee in the form of shares of Common Stock (or a
combination of shares of Common Stock or cash), the Company shall not issue any
shares of Common Stock to the Optionee to the extent that such issuance(s) (i)
is prohibited by any rule, regulation or policy of the Securities and Exchange
Commission or of The Nasdaq Stock Market, Inc., or any exchange or market upon
which the Common Stock may then be traded or (ii) whether alone, or in
connection with any other issuance(s) in the past that may be deemed to be
integrated with any such issuance(s) contemplated herein, would require
shareholder approval as contemplated by the Nasdaq Marketplace Rules and
specifically Rule 4460, as determined as of any Exercise Day; PROVIDED FURTHER,
that this subsection (ii) shall not be applicable if the Company has previously
sought and obtained shareholder approval for such issuance(s).

                                        3

<PAGE>


7.       ADJUSTMENT OF SARS AND COLLAR PRICES; MAXIMUM PROCEEDS.

         A. Notwithstanding anything contained in this SAR Agreement to the
contrary (subject to the limitation set forth in Section 7.B. below and subject
to adjustment pursuant to Section 4 hereof), to the extent that the Fair Market
Value of a share of common stock as of the date immediately preceding the
executing of this SAR Agreement is greater than the floor Collar Price of
$5-3/32 then:

            (i) the floor Collar Price shall be adjusted to the then Fair Market
Value, and the ceiling Collar Price shall be adjusted to a dollar amount equal
to the then Fair Market Value plus $25.00; and

            (ii) the Aggregate Base Common Stock shall be adjusted (the 
"Adjusted Aggregate Base Common Stock") by multiplying 600,000 by a fraction,
(x) the numerator of which shall be the adjusted floor Collar Price and (y) the
denominator of which shall be $5-3/32; provided that the Adjusted Aggregate Base
Common Stock shall in no event exceed a maximum of Seven Hundred Thousand
(700,000) shares of Common Stock.

         B. Notwithstanding anything contained in this SAR Agreement to the
contrary, the maximum aggregate proceeds (whether in cash, stock or a
combination thereof) that may be received by the Optionee from the Company from
the exercise of the SAR rights issued pursuant to this SAR Agreement shall not
exceed Fifteen Million Dollars ($15,000,000).

8.       REGISTRATION RIGHTS. If shares of Common Stock are to be delivered, 
then (i) such shares must either be registered, or (ii) the Company will as soon
as practicable thereafter, file with the Securities and Exchange Commission (the
"SEC") under the Act a registration statement to register such shares of Common
Stock and will use its reasonable best efforts to have such registration
statement declared effective by the SEC as promptly as possible. In either
event, the Company shall use its reasonable best efforts to maintain the
effectiveness of such registration statement until such shares could be sold by
Optionee on an unrestricted basis under Rule 144.

9.       AMENDMENTS. The provisions of this SAR Agreement may not be amended,
supplemented, waived or changed orally, except by a writing signed by the party
as to whom enforcement of any such amendment, supplement, waiver or modification
is sought and making specific reference to this SAR Agreement.

10.      TRANSFERS. The SARs may not be transferred other than to an affiliate
of the Optionee without the Company's consent.

11.      FURTHER ASSURANCES. The parties hereby agree from time to time to 
execute and deliver such further and other transfers, assignments and documents
and do all matters and things which may be convenient or necessary to more
effectively and completely carry out the intentions of this SAR Agreement.

                                        4

<PAGE>


12.      BINDING EFFECT. All of the terms and provisions of this SAR Agreement,
whether so expressed or not, shall be binding upon, inure to the benefit of, and
be enforceable by the parties and their respective administrators, executors,
legal representatives, heirs, successors and permitted assigns.

13.      GOVERNING LAW. This SAR Agreement and all transactions contemplated by 
this SAR Agreement shall be governed by, and construed and enforced in
accordance with, the internal laws of the State of Florida without regard to
principles of conflicts of laws.

14.      ENTIRE AGREEMENT. This SAR Agreement represents the entire 
understanding and agreement among the parties with respect to the subject matter
hereof, and supersedes all other negotiations, understandings and
representations (if any) made by and among such parties.

         IN WITNESS WHEREOF, the undersigned have executed this SAR Agreement as
of the date first above written.

                                            THE COMPANY:

                                            ABLE TELCOM HOLDING CORP.

                                       By: /s/ BILLY V. RAY, JR.
                                           -----------------------------------
                                       Name: BILLY V. RAY, JR.
                                             ---------------------------------
                                       Its: CEO and PRESIDENT
                                            ----------------------------------

                                            OPTIONEE:

                                            WORLDCOM NETWORK SERVICES, INC.

                                       By: /s/ DAVID E. MEYERS
                                           -----------------------------------
                                       Name: DAVID E. MEYERS
                                             ---------------------------------
                                       Its: VP and CONTROLLER
                                            ----------------------------------


                                        5