EMC AA
Locomotive class
title: "EMC AA" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["a1a-3-locomotives", "electro-motive-division-locomotives", "missouri-pacific-railroad", "passenger-locomotives", "diesel–electric-locomotives-of-the-united-states", "railway-locomotives-introduced-in-1940", "scrapped-locomotives", "standard-gauge-locomotives-of-the-united-states"] description: "Locomotive class" topic_path: "geography/united-states" source: "https://en.wikipedia.org/wiki/EMC_AA" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary Locomotive class ::
::data[format=table title="Infobox locomotive"]
| Field | Value |
|---|---|
| name | EMC AA |
| powertype | Diesel-electric |
| caption | Missouri Pacific 7100 |
| builder | General Motors Corporation (EMC/GM) |
| builddate | August 1940 |
| totalproduction | 1 |
| aarwheels | A1A-3 |
| gauge | |
| locoweight | 247340 lb |
| weightondrivers | 97700 lb |
| fuelcap | 1200 usgal |
| primemover | EMC 12-567 |
| enginetype | V12 diesel |
| cylindercount | 12 |
| maxspeed | 98 mph |
| poweroutput | 1000 hp |
| tractiveeffort | 24425 lbf at 34 mph |
| operator | Missouri Pacific Railroad |
| fleetnumbers | 7100 |
| retiredate | 1962 |
| disposition | Scrapped |
| :: |
| name = EMC AA | powertype = Diesel-electric | image = | caption =Missouri Pacific 7100 | builder =General Motors Corporation (EMC/GM) | builddate = August 1940 | totalproduction = 1 | aarwheels = A1A-3 | gauge = | locoweight = 247340 lb | weightondrivers = 97700 lb | fuelcap = 1200 usgal | primemover = EMC 12-567 | enginetype = V12 diesel | cylindercount = 12 | maxspeed = 98 mph | poweroutput = 1000 hp | tractiveeffort = 24425 lbf at 34 mph | operator = Missouri Pacific Railroad | fleetnumbers = 7100 | retiredate = 1962 | disposition = Scrapped 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 by R. Craig, and the designation is logical as the locomotive is described as "half an E6" in the Second Diesel Spotter's Guide.
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.
References
References
- Craig, R.. "Missouri Pacific All-Time Diesel Summary".
- Pinkepank, Jerry A.. (1973). "The Second Diesel Spotter's Guide". Kalmbach Publishing Co..
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