The railway line was authorised by Article 4 of an international agreement of 15 October 1869, concerning the construction and operation of the
Gotthard Railway. The building of the Connecting Line was licensed by the Swiss federal government on 14 March 1870. On 3 November 1873 the line was opened, including a one-line bridge over the Rhine. Following an agreement between the then
Swiss Central Railway and the
Grand Duchy of Baden State Railways, the Connecting Line was built as a joint line by both companies. The project was exclusively funded by the Central Railway, which became its owner and it is now owned by the
Swiss Federal Railways (SBB). Since the railway reform, the rail infrastructure is managed exclusively by the SBB. SBB, Deutsche Bahn and many other companies operate on the line. The property boundary is at the 3.537 km chainage mark (at the north head of the Rhine bridge). ==Technology ==