flat wagon

plural flat wagons

1. UKrail transportAn open railway wagon without sides and roof, or with very low sides.

   Two flat wagons carrying tanks were also seen here.

   1944 January and February, “Light Railways in Derbyshire”, in Railway Magazine, page 25

   1 more example

   One train ferry wagon, with the inscription "On hire to L.N.E.R.," was carrying British prisoners; and another odd sight was an L.N.E.R. container on a German flat wagon, offering "Door to Door Transport."

   1946 March and April, “Notes and News: Train Watching in a P.O.W. Camp”, in Railway Magazine, page 117

   Synonyms: flatcar, flatbed, truck