The EMD SW1001 is a diesel switcher locomotive built by General Motors' Electro-Motive Division between September 1968 and June 1986. A total of 230 were constructed, mainly for North American railroads and industrial operations.
The SW1001 was developed because EMD's SW1000 model had proved unpopular among industrial railroad customers, as the heights of its walkway and cab eaves were much greater than those of earlier EMD switcher models. The overall height was similar, but the SW1000's roof was much flatter in curvature. Industrial railroads that only operated switchers often had facilities designed to the proportions of EMD's earlier switchers. 18 by companies in Mexico: 12 by AHMSA, 3 by Lazaro Cardenas Steel (ArcelorMittal), and 3 by Pemex. In Asia the Korean National Railway acquired 28 between 1969 and 1971. and another by Hanson Aggregates in 2000 both for use on quarry industrial sites in the England. They are based at Whatley Quarry and Merehead Quarry, both part of Mendip Rail operations.
Five were bought for the government railways of Saudi Arabia in 1981.