Railway truck is a term used to describe a type of vehicle used in the transportation of goods and materials. The two crossword solutions for this term are HOPPER, which is a six-letter word, and WAGON, which is a five-letter word. A HOPPER is a type of railway truck that has an open top and is used to transport bulk materials such as grain or coal. A WAGON is a type of railway truck that is enclosed and is used to transport goods such as containers or pallets.