From all the responses Lionel did not put a manufacturing date anywhere on a lot of cars. I know that a majority of cars have the date stamped on the shell as to when it was built. I was looking for more specific information on the engines than boxcars and the like. One in particular is a 152 prewar engine. I think it was first produced around 1915 and was one of the first O gauge engines Lionel made. Correct me if I am wrong.
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