The Thalwil–Arth-Goldau railway is a Swiss railway that acts as a feeder route to the Gotthard Railway. It was opened for this purpose on 1 June 1897, with the Thalwil–Zug section owned by the Swiss Northeastern Railway and the Zug–Arth-Goldau section owned by the GB. Since the nationalisation of the GB in 1909, the entire route has belonged to the Swiss Federal Railways.

The Gotthard railway is the Swiss trans-alpine railway line from northern Switzerland to the canton of Ticino. The line forms a major part of an important international railway link between northern and southern Europe, especially on the Rotterdam-Basel-Genoa corridor. The Gotthard Railway Company was the former private railway company that financed the construction of and originally operated that line.