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Technical Data |
The SD70M is very similar to the SD70MAC and SD70I, the main difference being that the SD70M uses D90TR DC traction motors and the SD70MAC uses AC traction motors. They are capable of generating 109,000 lbf (480 kN) of continuous tractive effort. From mid-2000, the SD70M was produced with SD45-style flared radiators allowing for the larger radiator cores needed for split-cooling. Split-cooling is a feature that separates the coolant circuit for the prime mover and the circuit for the air pumps and turbocharger.
Production of the SD70M ceased in late 2004 as production of the SD70M-2 model began (the EPA's Tier II regulations went into effect on January 1, 2005). 1,646 examples of the SD70M model were produced. Purchasers included CSX, New York Susquehanna & Western (NYSW; part of EMDX order no. 946531), Norfolk Southern and Southern Pacific (SP; now part of the Union Pacific Railroad), but the vast majority were purchased by Union Pacific.