It is also called the Filzenexpress, which refers to the former raised bog (known in Bavarian as Filz)) it crosses in the Ebrach valley.

A six-kilometer section at the western end from Grafing station to the town of Ebersberg is electrified as part of line S 4 of the Munich S-Bahn.

The line has been laid over the next two kilometres in a large loop to the south to provide a reasonable slope to cope with the difference in height between Ebersberg station and the Ebrach river.

The tunnel, the town station and the tracks were covered during the closing of this section of the line with gravel and the sidings were demolished.

Due to the hilly topography Wasserburg station was built about four kilometres west of the town in the village of Reitmehring.

By the early 1880s, therefore, several initiatives had emerged to build a branch line from Wasserburg via Ebersberg towards the west, but these efforts were not successful at first.

In the initial planning, the line would have run from there via Hörmannsdorf to Ebersberg, but it decided to use a route via Wiesham and the centre of Grafing instead.

Ebersberg submitted two petitions in 1891 calling for the acceleration of its construction, which highlighted the expected economic impact of the line for the transport of timber from the Ebersberg Forest and demanded the construction by the state as compensation for damage to the forest by a plague of Black Arches caterpillars.

The land acquisition proved lengthy and more expensive than originally planned, so that the link was not completed until the end of 1902.

Difficulties were experienced in the construction of the crossing of the Laufing bog (Laufinger Moos) near Ebersberg, where the embankment subsided several times.

Commissioning took place without any major celebrations with trial runs on 27 September and scheduled services commencing on 1 October 1903.

In its early years, DB used locomotives of class 64 and 98.3 (Glaskasten, "glass box") at times on the line.

In the 1960s, it was decided to section from Grafing station to central Ebersberg, which had substantial traffic, would be included in the future network of the Munich S-Bahn.

S-Bahn operations began on 28 May 1972; simultaneously the Grafing–Ebersberg section was included in the fare zone of the Münchner Verkehrs- und Tarifverbund (Munich Transport and Tariff Association, MVV).

South of the district of Burgau, about 1 km from Wasserburg town, the track over a clogged culvert was undermined for a distance of several metres, so operations had to be suspended on this section.

The damaged section was not fixed, but instead DB transported “trapped" rail vehicles from Wasserburg town by road.

The local authority declined to close the line, so the council of the district of Rosenheim, in which the Forsting–Wasserburg section is located, agreed on 28 June 1989 that closure would undermine the role of regional rail.

During the first half of the decade, only a pair of services ran on the track each day from Monday to Friday, although on weekends the timetable was a bit more extensive.

TAG Tegernsee Immobilien und Beteiligung had offered several times since 1989, under certain conditions—including investment in the track and rolling stock amounting to about 40 million marks—to take over responsibility for the line.

A year later, on 2 June 1996, services between Ebersberg and Wasserburg were improved under the Bavarian clock-face timetable ("Bayern-Takt").

The Bayerische Eisenbahngesellschaft (Bavarian Railway Company), as the authority for funding regional rail passenger services in Bavaria as of 1 January 1994, ordered changes to the timetable operated by Deutsche Bundesbahn’s subsidiary DB Regio AG, which envisaged nine pairs of trains on weekdays.

The delivery and collection of wagons as required up to twice a week at night, starting from Mühldorf, use locomotives of class 294.