Prob the first place to look is on the bottom of the chasis, they often have the model number there and usually the maker. From there prob could do a google search to try and find what it is. The other way is if you know the maker and there is a number on the engine, that can be used to look it up, especially with post war engines (for example, Lionel 671 is the Pennsy S2 Turbine from late 40's).
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