The Herceghalom rail crash occurred on 1 December 1916 at 00:24 in the station of Herceghalom, Hungary, on the Budapest–Hegyeshalom line as a side collision of an express train running into a shunting passenger train.

Emperor Franz Joseph I of Austria, who was also King of Hungary, Croatia and Bohemia had died on 21 November 1916 in Schönbrunn.

The express train No 3 from Vienna to Budapest was split into two parts because of the high demand.

The engine driver of the first part of express train No 3 passed the pre-signal with a speed of 76 km/h (47 mph).

All comments about the signals and the begin of braking are from the engine driver, as no automated control systems were installed.