A-unit
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An A-unit, in railroad terminology, is a diesel locomotive equipped with a driving cab and a control system to control other locomotives in a multiple unit, and therefore able to be the lead unit in a
An EMD SD40 A-unit owned by BNSF Railway
EMD DD35
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The EMD DD35 was a 5,000 horsepower diesel-electric locomotive of D-D wheel arrangement built by General Motors Electro-Motive Division for the Union Pacific Railroad and Southern Pacific Railroad.
Two Union Pacific Railroad EMD DD35s sandwiched between a lead SD45 (#3638) and an unidentified trailing unit.