General Motors purchased EMC (Electro Motive Corporation) and Winton Engine in 1930.
EMC was a subsidiary of GM until 1941 when it became a full division (EMD). Switchers
built prior to February 1939 were powered by the 201A engine, after that the 567 series
followed by the 645 series engines were used.

EMD Switchers Family Tree, part 2, 567 powered (PDF document opens in new window)

567 Powered Models

SW1   NW2 - 567 & 567A
SW7 - 567A
SW8   SW9 - 567B
SW600   SW900   SW1200 & SW1200RS - 567C

Passenger Terminal Units
NW3
NW5

Transfer Units
TR - pre-war NW2 based cow/calf
TR1 - FT/NW3 based cow/calf
TR2 - NW2 based cow/calf
TR3 - NW2 based cow/calf/calf
TR4 - SW7 based cow/calf
TR5 - SW9 based cow/calf
TR6 - SW8 based cow/calf
TR12 - SW1200 based cow/calf


EMD Switchers Family Tree, part 3, 645 powered (PDF document opens in new window)

645 Powered Models

SW1000   SW1001       (1000 vs 1001 spotting)
SW1500   SW1504
MP15 - MP15DC MP15AC MP15T


Industrial

Model 40


EMD Switcher Spotting Guide

Production Time Line - number produced in brackets




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