EXHIBIT 4 October 12, 2001 Atchison Casting Corporation 400 South 4th Street Atchison, Kansas 66002-0188 Attention: Chief Financial Officer Re: Atchison Casting Corporation (the "Company") April 3, 1998 Amended and Restated Credit Agreement by and among the Company, Harris Trust and Savings Bank, as Agent and the Banks party thereto (as heretofore amended, the "Credit Agreement") Ladies and Gentlemen: Pursuant to the Eleventh Amendment and Forbearance Agreement dated as of September 12, 2001 (as amended by that certain side letter dated September 20, 2001, the "Eleventh Amendment") the Bank Group agreed to temporarily forbear from enforcing its rights and remedies with respect to the Credit Agreement through October 12, 2001 (the "Standstill Expiration Date"). The Company has requested that the Bank Group extend the Standstill Expiration Date through November 2, 2001. Accordingly, effective upon the execution of this letter by the Required Banks, the Company and each Guarantor in the spaces provided for that purpose below (which execution may be on separate counterparts of this letter, all of which are to constitute one and the same instrument), (i) the Standstill Period shall be extended so that the new Standstill Expiration Date shall be November 2, 2001, (ii) Section 11(h) of the Eleventh Amendment is amended by deleting the date "October 12, 2001" appearing therein and inserting in its place the date "November 2, 2001" and (iii) Section 18 of the Eleventh Amendment is amended by deleting the date "October 17, 2001" appearing therein and inserting in its place the date "November 7, 2001." Except as specifically waived hereby, all of the terms and conditions of the Credit Agreement shall remain in full force and effect and are deemed to be reaffirmed as of the date hereof. Without limiting the generality of the foregoing, this letter does not waive any of the other Defaults or Events of Default that now exist. All defined terms used herein and not defined herein shall have the same meaning herein as in the Tenth Amendment. This waiver shall be governed and construed in accordance with the laws of the State of Illinois. All capitalized terms used herein without definition shall have the same meaning herein as such terms have in the Credit Agreement. Very truly yours, HARRIS TRUST AND SAVINGS BANK, in its individual capacity as a Bank and as Agent By: /s/ Neal Golub Title: Vice President COMMERCE BANK, N.A. By: /s/ Dennis R. Block Title: Senior Vice President FIRSTAR BANK MIDWEST, N.A. (f/k/a Mercantile Bank) By:________________________________________ Title:_____________________________________ KEY BANK NATIONAL ASSOCIATION By: /s/ G. M. Adams Title: Vice President COMERICA BANK By: /s/ Andrew R. Craig Title: Vice President HIBERNIA NATIONAL BANK By:_______________________________________ Title:____________________________________ NATIONAL WESTMINSTER BANK PLC Nassau Branch By: /s/ Peter Ballard Title: Head of Mid Corporate Team Corporate Restructuring Unit New York Branch By: /s/ Peter Ballard Title: Head of Mid Corporate Team Corporate Restructuring Unit WELLS FARGO BANK, NATIONAL ASSOCIATION (successor by merger to Norwest Bank Minnesota, N.A.) By: /s/ Calvin R. Emerson Title: Vice President Agreed and Accepted: ATCHISON CASTING CORPORATION By: /s/ Kevin T. McDermed Title: Vice President & Treasurer AMITE FOUNDRY AND MACHINE, INC. PROSPECT FOUNDRY, INC. QUAKER ALLOY, INC. CANADIAN STEEL FOUNDRIES, LTD. 3210863 CANADA INC. KRAMER INTERNATIONAL, INC. EMPIRE STEEL CASTINGS, INC. LAGRANGE FOUNDRY INC. THE G&C FOUNDRY COMPANY LOS ANGELES DIE CASTING INC. CASTCAN STEEL LTD. CANADA ALLOY CASTINGS, LTD. PENNSYLVANIA STEEL FOUNDRY & MACHINE COMPANY JAHN FOUNDRY CORP. INVERNESS CASTINGS GROUP, INC. DU-WEL PRODUCTS, INC. DAVIS CASTING AND ASSEMBLY, INC. CLAREMONT FOUNDRY, INC. LONDON PRECISION MACHINE & TOOL LTD. By: /s/ Kevin T. McDermed Title: Vice President GILMORE INDUSTRIES, INC. By: /s/ John R. Kujawa Title: President