The MPI MP20B is a diesel-electric locomotive designed and built by MotivePower in Boise, Idaho.
Specifications.
It has a MTU-Detroit Diesel 12V4000 engine. It weighs approximately 277,000 lb and is 59 ft 2 in long. It has a maximum speed of . It also includes a B-B wheel arrangement and an optional dynamic brake. It includes a continuous tractive effort of and a starting tractive effort of .
Union Pacific MP20Bs were powered by a Caterpillar 3516C.
References.
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