Introduced in 1992, EMD's SD70M was a 4000 horsepower locomotive that ran on EMD's new steerable truck design, known as the HTCR-II radial truck. This new truck allowed the locomotive to transfer its power to the rails more efficiently, which in turn enabled two SD70M locomotives to pull a train that would have taken three SD40-2s to pull. The early version of this locomotive had a flat radiator rather than the more effective flared radiators of later versions.