The Transportation Equipment Division of the WPB announced a production schedule on December 10, 1943, that allowed Alco to build one 4500 horsepower experimental diesel locomotive.
The locomotives were powered by a V12 ALCO 241 diesel engine, rated at 1,500 hp (1.1 MW).
[2] With the B-B wheel arrangement and carbody construction, equipment layout and electrical gear these experimental units were the immediate predecessors of the FA units to come in early 1946.
Outwardly, the bodies strongly resembled those on the DL-109, some of which were still under construction at Schenectady in early 1945.
As no orders materialized for such units, and no railroad bought the demonstrators, the set was scrapped in Schenectady New York September 1947.