Wiktionary
n. 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.
Usage examples of "trailing truck".
Pitt was ready to dismiss the trailing truck as fantasy-his subconscious was beginning to see enemy agents, complete with, trench, coats and beady eyes, lurking behind every clump of philodendron.
If a train has both a leading and a trailing truck, that means that it can back easily into a curve.
The red-haired agent was coming around the front of the truck, to go with them, and a couple of agents from the trailing truck were getting out.
Someone was coming around and, not wanting to stop, Grey leapt toward the injector pipe that ran perpendicular to the cab, just above the trailing truck.