AA was a designator used for several different diesel locomotive types custom built by General Motors Corporation EMC/GM with passenger or baggage space in the same body. This locomotive is listed as class AA-6[1] by R. Craig, and the designation is logical as the locomotive is described as "half an E6" in the Second Diesel Spotter's Guide.[2]

Type and origin
Power typeDiesel-electric
BuilderGeneral Motors Corporation (EMC/GM)
Build dateAugust 1940
Total produced1
Gauge4 ft 8 12 in (1,435 mm)
Adhesive weight97,700 lb (44,316.0 kilograms)
Loco weight247,340 lb (112,191.5 kilograms)
Fuel capacity1,200 US gal (4,500 l; 1,000 imp gal)
Prime moverEMD 567
Engine typeV12 diesel
Performance figures
Maximum speed98 mph (158 km/h)
Power output1,000 hp (746 kW)
Tractive effort24,425 lbf (108.65 kN) at 34 mph (55 km/h)
OperatorsMissouri Pacific Railroad

One such was a single locomotive built for the Missouri Pacific Railroad, delivered in August 1940, numbered #7100. MP 7100 was built for service with the Delta Eagle passenger train, which ran between Memphis, Tennessee and Tallulah, Louisiana. Note: Missouri Pacific ordered all their 'E' units with portholes instead of square windows like most of the E series from the EA to E7's. This was the only MoPac unit with square windows (on the baggage door).

Since the two-car train the unit would have to haul was comparatively light, the AA was built with only one 1,000 hp EMD 567 V12 prime mover, and a baggage compartment where the second diesel would have been.

Other EMC/GM locomotives carrying the AA classification include the Pioneer Zephyr, Flying Yankee, and General Pershing Zephyr power units.


  1. Craig, R. "Missouri Pacific All-Time Diesel Summary". The Diesel Shop.
  2. Pinkepank, Jerry A. (1973). The Second Diesel Spotter's Guide. Milwaukee, Wisconsin: Kalmbach Publishing Co. p. EMD-122. ISBN 0-89024-026-4.
  • Marre, Louis A. (1995). Diesel Locomotives: The First 50 Years. Waukesha, Wisconsin: Kalmbach Publishing Co. p. 123. ISBN 0-89024-258-5.
  • EuDaly, Kevin (1994). Missouri Pacific Diesel Power. Kansas City, Missouri: White River Productions. pp. 24–27. OCLC 32700939.
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