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This Identification Guide for Lionel Electric Trains covers the "Post-war Era" only from 1945 until 1969.
LIONEL TRAINS RIO GRANDE SP TYPE CABOOSE No. 6657
The Rio Grande SP Type Caboose No. 6657 was manufactured in 1957 and 1958 with bar-end trucks and one tabbed magnetic coupler. The one variation has to do with the color of the body mold and it was made on a Type 3A die. The way to tell the difference between the two is to look for the ladder slots. The (B) variation doesn’t have them.