SF Rjukanfoss, prior to 1946 named Rjukanfos, was steam-powered railway ferry that operated between Mæl

Mæl Station

Mæl Station is a railway station on Rjukanbanen and where the railway cars on the line were transferred to the railway ferry to Tinnoset. The station is located 16 km from Rjukan and on the mouth of the river Måna in Vestfjorddalen where the river runs into Tinnsjå.The station was built in...

 and Tinnoset

Tinnoset Station

Tinnoset Station was a railway station on Tinnosbanen located at Tinnoset in Notodden, Norway. At the station was the docks where wagons were transferred from trains to the Tinnsjø railway ferry....

 on the lake Tinnsjø, Norway

Norway

Norway , officially the Kingdom of Norway, is a Nordic unitary constitutional monarchy whose territory comprises the western portion of the Scandinavian Peninsula, Jan Mayen, and the Arctic archipelago of Svalbard and Bouvet Island. Norway has a total area of and a population of about 4.9 million...

. Owned by Norsk Transport

Norsk Transport

Norsk Transport AS was a railway- and shipping company responsible for the transport of chemicals from Norsk Hydro Rjukan. A subsidiary of Norsk Hydro, the company was founded in 1907 and operated until 1991....

, she was launched in 1909, expanded in 1946 and decommissioned in 1969.

Specifications

Rjukanfos was the first ferry delivered to Norsk Transport for the Tinnsjø railway ferry

Tinnsjø railway ferry

Tinnsjø railway ferry was a Norwegian railway ferry service on the lake Tinnsjå that connected the railways of Rjukanbanen and Tinnosbanen. The long ferry trip made it possible for Norsk Hydro to transport its fertilizer from the plant at Rjukan to the port in Skien...

 service. Built by Fevig Jernskibsbyggeri in 1908–09, she was delivered 43 meters (142 ft) long, at 338 gross tonnes

Tonnage

Tonnage is a measure of the size or cargo carrying capacity of a ship. The term derives from the taxation paid on tuns or casks of wine, and was later used in reference to the weight of a ship's cargo; however, in modern maritime usage, "tonnage" specifically refers to a calculation of the volume...

. There were two parallel standard gauge

Standard gauge

The standard gauge is a widely-used track gauge . Approximately 60% of the world's existing railway lines are built to this gauge...

 tracks down the length of the ship, in total 66.6 metres (218.5 ft), with a single track to loading at the front. The nine railway wagons could hold 240 tonnes, in addition to 120 passengers. She was equipped with two 150 kW (200 hp) steam engines, and able of 9 knots.

She was rebuilt in 1945–46, changing her name to Rjukanfoss. She was lengthened to 69 meters (225 ft), at 684 gross tonnes. The trackage was lengthened to 120 metres (393.7 ft) allowing 550 tonnes cargo in 16 cars, and the number of passengers increased to 250. Two new engines were installed, each at 340 kW (450 hp) and automatic coal feeding, giving her a lower coal consumption than SF Ammonia

SF Ammonia

SF Ammonia is a steam powered railway ferry on Tinnsjø that connected Rjukanbanen with Tinnosbanen, Norway. The ferry was one of the four railway ferries on Tinnsjø that was used by Norsk Hydro to transport chemicals from Rjukan to the port in Skien...

.