Lionel made gradual additions as production went on (the more recent versions added diecast fuel tanks and pilots, cab interiors with crew figures, electrocouplers, RailSounds improvements and additions [like crew talk] as those became available, etc.
These engines are about as bulletproof as you can get, and from even a short distance away it's pretty hard to tell a "scale" version Geep from these so- called traditional Geeps (which are scale sized as well, of course).
as awesome as these engines sound I think I'm going to start to be on the look out for one of these. They look very nice.
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