The EMD AB6 was a
diesel locomotive type built exclusively for the
Chicago, Rock Island and Pacific Railroad (the "Rock Island Line") by
General Motors'
Electro-Motive Division and delivered in June
1940. Two examples were built, numbered #750 and #751. They were built for the Rocky Mountain Rocket
passenger train, which travelled as a unified train from
Chicago, Illinois, to
Limon, Colorado, but then divided, one segment going to
Colorado Springs, Colorado, and the other to
Denver, Colorado. The Rock Island desired a locomotive which could look like an integrated part of the train during the Chicago-Limon portion of the route, but could then be operated independently to take three cars to Colorado Springs. A regular, cab-equipped A-unit could have been purchased, but that would have ruined the streamlined look of the train, so the RI had EMD build a flat-fronted locomotive based on an
E-series EMD E6B (
B unit) but with an operating cab, headlight,
pilot and other features to enable it to operate as an independent locomotive.
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