AAR wheel arrangement
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The AAR wheel arrangement system is a method of classifying locomotive wheel arrangements that was developed by the Association of American Railroads. Essentially a simplification of the European UIC
The Union Pacific 6936: an example of a D-D locomotive
EMD SD70 series
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The EMD SD70 is a series of diesel-electric locomotives manufactured by Electro-Motive Diesel. This locomotive family is an extension and improvement of the EMD SD60 series. Production commenced in la
AAR wheel arrangement
…and speeds, after which every Indian-built WDP-4 had this configuration, until it was developed into "WDP-4B", with a C-C configuration. Twenty SD70ACe-P4 locomotives were built by EMD with a B1-1B arrangement that has two three axle trucks with each truck having two AC traction motors and one idler axle…
UP 1996, an SD70ACe wearing a Southern Pacific Railroad heritage livery
Illinois Central SD70 No. 1004
Union Pacific SD70M No. 4352
Canadian National SD70I No. 5619