 Standard GP40-2 production totalled 861 units, with 817 built for U.S. railroads, and 44 for Mexican railroads.In addition, three GP40P-2s, passenger versions of the GP40-2, were built for Southern Pacific in 1974, and 279 GP40-2L(W) and GP40-2(W) units, equipped with wide-nosed cabs, were built by General Motors Diesel (GMD), for Canadian National and GO Transit between 1974 and 1976.Of the CN units, 233 were built with a taller and lighter frame to allow for a larger fuel tank.