North eastern railway zone is headquartered at Gorakhpur and comprises Lucknow, Varanasi and Izzatnagar or Bareilly division. The North Eastern Railway was formed on 14 April 1952 by combining two Railway systems the Oudh and Tirhut Railway and Assam Railway and the Cawnpore-Achnera Provincial State Railway of the Bombay, Baroda and Central India Railway. By December 2017, railways for the first time installed 6,095 GPS-enabled "Fog Pilot Assistance System" railway signalling devices in four most affected zones: NR, NCR, NWR and NER. With these devices, train pilots precisely know in advance, about the location of signals, level-crossing gates and other such approaching markers.