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To help combat locomotives overheating in tunnels, SP and EMD developed the SD40T-2 and SD45T-2 models. The “T” (or Tunnel) refers to the modified design of moving the air intake lower near the rear end walkway to bring in cooler air and thus reducing engine overheating in tunnels. With the success of the EMD SD45, SP ordered the SD45T-2, needing the higher HP to help move heavy freight over the steep grades of Donner and Tehachapi. SP was pleased with the results and ordered over 200 units from 1972 to 1975 becoming part of the backbone of their locomotive fleet.
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