 The railway ferry service was provided by four different ships, SF "Rjukanfoss", SF "Hydro", SF "Ammonia" and MF "Storegut".The three first were steam ships, and the latter two are still docked at Mæl.The service was the only ever railway ferry service on a lake in Norway, and D/F "Ammonia" is the only remaining railway ferry steam ship in the world.