UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 144

OMB APPROVAL

OMB Number:     3235-0101

Expires:                 December 31, 2006

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NOTICE OF PROPOSED SALE OF SECURITIES

PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933

SEC USE ONLY

DOCUMENT SEQUENCE NO.

CUSIP NUMBER

ATTENTION:      Transmit for filing 3 copies of this form concurrently with either placing

                              an order with a broker to  execute sale or executing a sale directly with a

                              market maker

WORK LOCATION

1(a) NAME OF ISSUER (Please type or print)

WESTINGHOUSE AIR BRAKE TECHNOLOGIES CORPORATION

2(a) NAME OF PERSON FOR WHOSE ACCOUNT THE

         SECURITIES ARE TO BE SOLD

WILLIAM E. KASSLING

Title of the

Class of

Securities

to be Sold

Number of Shares
or Other Units

to be Sold

(See instr. 3(c))

Aggregate Market
Value

(See instr. 3(d))

Number of Shares
or Other Units
Outstanding

(See instr. 3(e))

PNC ADVISORS

300 DELAWARE AVE., 6^TH FLOOR

WILMINGTON, DE 19899

$15,385,500

as of 5/10/06

1. (a) Name of Issuer

    (b) Issuer’s I.R.S. Identification Number

    (c) Issuer’s S.E.C. file number, if any

    (d) Issuer’s address, including zip code

    (e) Issuer’s telephone number, including area code

2. (a) Name of Person for whose account the securities are to be sold

    (b) Such person’s I.R.S. identification number, if such person is an entity

    (c) Such person’s relationship to the issuer (e.g., officer, director, 10% stockholder, or

         member of immediate family of any of the foregoing)

    (d) Such person’s address, including zip code

3. (a) Title of the class of securities to be sold

    (b) Name and address of each broker through whom the securities are intended

          to be sold

    (c) Number of shares or other units to be sold (if debt securities, give the

          aggregate face amount)

    (d) Aggregate market value of the securities to be sold as of a specified date

          within 10 days prior to the filing of this notice

    (e) Number of shares or other units of the class outstanding, or if debt

          securities the face amount thereof outstanding, as shown by the most

          recent report or statement published by the issuer

    (f) Approximate date on which the securities are to be sold

    (g) Name of each securities exchange, if any, on which the securities are

          intended to be sold

Title of

the Class

Date you

Acquired

Nature of Acquisition Transaction

Name of Person from Whom
Acquired

(If gift, also give date donor
acquired)

Amount of
Securities
Acquired

1. If the securities were purchased and full payment therefor was not made in

    cash at the time of purchase, explain in the table or in a note thereto the nature

    of the consideration given. If the consideration consisted of any note or other

    obligation, or if payment was made in installments describe the arrangement

    and state when the note or other obligation was discharged in full or the last

    installment paid.

2. If within two years after the acquisition of the securities

    the person for whose account they are to be sold had any short

    positions, put or other option to dispose of securities referred

    to in paragraph (d)(3) of Rule 144, furnish full information with

    respect thereto.

Name and Address of Seller

WILLIAM E. KASSLING

c/o WABTEC CORP

1001 AIR BRAKE AVENUE

WILMERDING, PA 15148

May 11, 2006

DATE OF NOTICE

/s/    William E. Kassling        

SIGNATURE