trailing truck ( synonym found)
Definition of trailing truck:

°On a steam locomotive, a railroad truck to which wheel axles (and, hence, wheels) for one or more coupled pairs of unpowered wheels are attached through bearings, located behind the driving wheels.
Definition of trailing truck:

°On a steam locomotive, a railroad truck to which wheel axles (and, hence, wheels) for one or more coupled pairs of unpowered wheels are attached through bearings, located behind the driving wheels.
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