[KJKingJ]

ATP (http://en.wikipedia.org/wiki/Automatic_train_protection) is present on some Great Western trains, and TWPS (http://en.wikipedia.org/wiki/Train_Protection_%26_Warning_Sy...) is present on some others. There is also AWS (http://en.wikipedia.org/wiki/Automatic_warning_system_(railw...). Looking through the list of rail accidents in the UK (http://en.wikipedia.org/wiki/List_of_rail_accidents_in_the_U...), the last one caused by a signal passed at danger was the Ladbroke Grove accident in 1999 (http://en.wikipedia.org/wiki/Ladbroke_Grove_rail_crash).

There are still regular incidents though, such as the one at Wootton Bassett recently (http://en.wikipedia.org/wiki/2015_Wootton_Bassett_SPAD_incid...).