Here is the explanation from the Second Diesel Spotters Guide:
Model: LWT12
HP: 1200
Cyl: 12
Engine: 567C
Period Produced: 1956
Number Units Sold: 3
Two demonstrator Aerotrains were built with 1001 spending several months in
1956 leased to NYC and operating Cleveland-Chicago revenue schedules. Late
in 1956, 1001 made tests on the Santa Fe, then operated as the UP City of
Las Vegas in the summer of 1957. Demonstrator no. 1000 operated New
York-Pittsburgh revenue schedules on PRR in 1957. Both were returned to EMD
in 1957 and were later sold to Rock Island as RI nos. 2 and 3. The other
Aerotrain-type unit was RI 1, built originally to power RI's Talgo Jet
Rocket. The Talgo and the two Aerotrains ended their days in Chicago
commuter service. In 1966, RI donated one Aerotrain each, with locomotives,
to the museums in Green Bay and St. Louis, having scrapped no. 1 and the
Talgo cars.
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Hope this helps!
Regards from sunny San Diego,
John Lewis
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