"Baby Trainmasters" were FM H-16-66s built after the introduction of the H-24-66 "Trainmaster" engines in 1953. The differences were primarily inside the engines. For easier construction, the H-16-66s built in 1953 or later used the same body parts, trucks, etc. as the Trainmaster, so externally were almost indistinguishable except for being about 3-1/2' shorter than the H-24-66.
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