A transtainer is a hoisting device for loading or unloading containers onto or from railway wagons. It is a gantry crane that usually travels on rails and is set up across a track bundle at a container terminal. The transtainer moves the containers alongside the track bundle, after which straddle carriers transport them to the storage area.
Transtainers are sometimes also used in the storage areas of container terminals in order to stack containers in large blocks. In that case, the transtainer will have pneumatic tyres.