This is the 10370th most frequent Russian word.
вагон
A "wagon" or "carriage" in a train.
Here, "вагон" refers to the physical train cars that compose a train.
Поезд включает десять вагонов.
The train includes ten carriages.
In this context, "вагон" metaphorically describes a large amount of goods, akin to a quantity a train wagon could hold.
На складе найден вагон бытовой техники.
A wagon-load of household appliances was found in the warehouse.
Here, "вагон" specifies an individual subway car or compartment in the metro system.