A hopper wagon is a wagon that empties its load from below. Unload the hopper wagon.
The doors open over a pit and the whole load runs out in under a minute. A hopper wagon is why coal and stone can be moved without anybody shovelling.
1nounhopper wagonA wagon that empties its load from below.
“The hopper wagon discharged the whole train without stopping.”
hopper wagon is a wagon.
Practised in Railways