EXHIBIT TO SCHEDULE 13G FILED BY NORTHERN TRUST CORPORATION Securities and Exchange Commission 450 Fifth Street, N.W. Washington, DC 20549-1004 Attention: Filing Desk, Stop 1-4 RE: Cummins Engine Co., Inc. ------------------------ Pursuant to the requirement of 240.13d-1(e)(1)(iii), this exhibit shall constitute our written agreement that the Schedule 13G to which this exhibit is attached is filed on behalf of Northern Trust Corporation and of its subsidiary(ies), as stated below, regarding our respective beneficial ownership in the above-captioned equity security. NORTHERN TRUST CORPORATION By: Perry R. Pero ------------- DATED: 1-10-97 As its: Sr. Executive Vice President ------- ---------------------------- The NORTHERN TRUST COMPANY By: Perry R. Pero ------------- As its: Sr. Executive Vice President ----------------------------