The Isar River Valley Railway is a standard gauge and electrified railway in the German state of Bavaria. Originally it was 51.1 km long, running from Munich South station to Bichl and was built from 1891 to 1898 in sections by the Lokalbahn AG company (LAG). The section from Munich South to Wolfratshausen was classified as a main line, while the section from Wolfratshausen to Bichl was classified as a branch line. In 1900, the LAG electrified the section from the Isartalbahnhof to Höllriegelskreuth for suburban services at 580 volts DC. In 1938, the LAG and, with it, the Isar Valley Railway were nationalised. After the Second World War, Deutsche Bundesbahn converted the electrification to 15 kV AC ; this was completed in 1955 and extended to Wolfratshausen in 1960. The northern section from Munich South to Grosshesselohe Isartal station and the southern section from Wolfratshausen to Bichl was closed by Deutsche Bundesbahn between 1959 and 1972. The middle section is now used by line S 7 of the Munich S-Bahn. The name of the line refers to the Isar as the northern half of the line follows the river's western bank. On the other hand, the southern section is located in the valley of the Loisach.

Wolfratshausen station is a station of the Munich S-Bahn. It is located in the Upper Bavarian town of Wolfratshausen in Germany. It is classified by Deutsche Bahn as a category 6 station. It has two platform tracks next to a central platform. The station is located in the network area of the Münchner Verkehrs- und Tarifverbund and is served by line 7 of the S-Bahn, which is operated by Deutsche Bahn.