Southern Punjab Railway Co. opened the Delhi–Bathinda–Samasatta line in 1897. The line passed through Muktasar and Fazilka tehsils and provided direct connection through Samma Satta (now in Pakistan) to Karachi. On 18 February 2006, Thar Express, an Indian non-stop international passenger train operated weekly by Indian Railways using its own coaches and locomotives, between Jodhpur in India and Karachi in Pakistan. Earlier, Sindh Mail train operated on this route from 1900 to 1965 when the track was bombed out by the Pakistan Air Force in Indo-Pakistani War of 1965. Thar Link Express was run started after 41 years in 2006 based on the earlier rail communication agreement. The rail communication agreement was signed by India and Pakistan in 1976, to ease the soured relations after the Indo-Pakistani War of 1971 for the successful liberation of Bangladesh by Indian Army. The rail communication agreement is renewable every three years, and currently it is valid until January 2019. In the 1990s, the Delhi–Jaipur line and Jaipur–Ahmedabad line were converted to broad gauge (BG). In 2007, the line going toward from Phulera to Chittaurgarh was converted to BG. Between 2008 and 2011, the Bikaner–Rewari line was converted to broad gauge. In 2009, the metre-gauge Hisar–Sadulpur section was converted to broad gauge. 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, Northern Railway zone, North Central Railway zone, North Eastern Railway zone and North Western Railway zone, by doing away with the old practice of putting firecrackers on train tracks to alter train divers running trains on snail's pace. With these devices, train pilots precisely know in advance, about the location of signals, level-crossing gates and other such approaching markers. Organisation This zone was formed on 1 October 2002, comprising four divisions: Jodhpur and reorganized Bikaner division of the erstwhile Northern Railway zone, and reorganized Jaipur and Ajmer divisions of the erstwhile Western Railway zone. Ajmer railway division The Ajmer railway division, founded on 5 November 1951, has ~9,050 employees handling 48 passenger trains across 141 stations (15 main stations with Computerized Passenger Reservation System), covering the elongated elliptical shaped loop railway network in Marwar region central Rajasthan, from Pushkar to Palanpur via Marwar, and from Palanpur back to Pushkar via Chittorgarh. The main goods traffic are the export of cement from Ajmer district, and rock phosphate and soapstone powder