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Type and origin
Power type Diesel-electric
Builder Electro-Motive Corporation (EMC)
Build date August 1940
Total produced 1
AAR wheel arr. A1A-3
Gauge 4 ft 8 12 in (1,435 mm)
Weight on drivers 97,700 lb (44,316.0 kilograms)
Locomotive weight 247,340 lb (112,191.5 kilograms)
Fuel capacity 1,200 US gal (4,500 l; 1,000 imp gal)
Prime mover EMD 567
Engine type V12 diesel
Cylinders 12
Performance figures
Maximum speed 98 mph (158 km/h)
Power output 1,000 hp (746 kW)
Tractive effort 24,425 lbf (108.65 kN) at 34 mph (55 km/h)
Operator(s) Missouri Pacific Railroad
Number(s) 7100
Retired 1962
Disposition Scrapped

AA was a designator used for several different diesel locomotive types custom built by Electro-Motive Corporation with passenger or baggage space in the same body.

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.

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 locomotives carrying the AA designation include the Pioneer Zephyr, Flying Yankee, and General Pershing Zephyr power units.


  • 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.