to its failure. Tripping past, and accidents When the signalling fails, etc., it may be necessary to "trip past" a train stop in the danger position, in accordance with the rules. With the train now working "on sight" it is important to travel at a low speed. If low speed is not maintained, then accidents can occur, such as Roseville collision, 1950 Berala train collision, 1952 Glenbrook rail accident, 1999 Depiction The car chase scene in the motion picture The French Connection shows a train stop being struck by a New York City elevated subway train as it approaches the train ahead of it on the same track. Although the moving train hits the train stop and begins to slow down, for the purposes of the film sequence, it was supposedly traveling too fast to reach a full stop before colliding with the train ahead. See also Automatic train protection (ATP) Automatic warning system - does not enforce a stop at a red signal Cab signalling Catch points Dead man's switch Derail Indusi or PZB - German train protection system Moorgate control Railway signal Train Protection & Warning System (TPWS) References Further reading General Railway Signal Co. (June 1979). Elements of Railway Signaling Train protection systems