[1] The platforms, underpass and the area around the station were modernised and redecorated in preparation for the Hessentag (Hesse Day) celebrations of 2010.

In 1904, a 600 meter long passing loop was built, the platforms were extended, and it was reclassified as a station.

A short time later, in 1908, the station building was opened and a second passing loop was built in the First World War.

During the Second World War the Allendorf explosives factories of Dynamit Nobel and WASAG were built and they were connected to the station with a total of 39 kilometres of track and 97 sets of points.

As a result, the station was greatly expanded (ten new tracks) and provided with two signal boxes.

Then, in 1964 the tracks in the station area were electrified and a modern waiting hall with a ticket office was installed in the entrance building.

After the Rhein-Main-Verkehrsverbund (Rhine-Main Transport Association, RMV) was established in 1995, and launched in 1997, the railway postal traffic was abandoned completely.

[5] The town of Stadtallendorf was the site of the Hessentag (Hesse day) celebrations of 2010 and the station was rehabilitated and made accessible for the disabled with federal and state grants totalling €7.3 million.

A modern bus shelter with a ticket office was built in 1964 on the western side and the main station building was completely renovated in 1968.

Freight transport in Stadtallendorf is dominated by the bulk traffic of the Fritz Winter foundry which is supplied over the rail with quartz sand among other things.

Another mechanical interlocking, Ao, is located in the southeast of the station at the junction of the railway sidings.