The Landau–Arnstorf railway was a branch line from Landau an der Isar to Arnstorf in the province of Lower Bavaria in southern Germany.

At the end of the 19th century the region around the market towns of Arnstorf and Eichendorf was surrounded by railways, but none actually entered the area.

After further discussions, for example about the option for an extension of the line to Münchsdorf, the Lokalbahn from Landau (Isar) to Arnstorf was approved by law on 30 June 1900.

On 4 July 1900 the folk of Landau and Arnstorf met at a joint celebration and sent a greeting and thank you telegram to the state government.

The line departed from the eastern end of Landau station and turned in a sharp bend into the valley of the River Isar, which it crossed.

Running alongside the district highway it reached the station of Arnstorf, a massive three-storey building on the northwestern side of the market town.

The anniversary special was hauled by locomotive 64 438, decked out in festive decorations, which left Landau at 13:10 and arrived in Arnstorf at 14:31.