Wiktionary
railroad trucks
n. (railroad truck English)
Usage examples of "railroad trucks".
The main difference between a cart and a container was that the containers weren't armored, and they were built much closer to the ground, being mounted on railroad trucks, rather than the huge, cross-country wheels we used on the carts.
Their baggage had arrived two days previously and, although only for five people, was enough, wilson said, to fill a couple of railroad trucks.