and the original building served as the parcel office for many years. In 1951, on 5 November the Jodhpur–Bikaner line was merged with the Western Railway. Sometime around or prior to 1991, the construction work for the conversion from meter gauge to wide broad gauge of the Jodhpur–Bikaner line, along with the link to Phulera, were started, and it was already functioning as broad gauge Jodhpur–Merta City–Bikaner–Bathinda line by 2008. In 2002, on 1 October the North Western Railway zone came into existence. On 14 April 1952, Northern Railway zone was notified as a new railway zone by merging Jodhpur Railway, Bikaner Railway, Eastern Punjab Railway and three divisions of the East Indian Railway north-west of Mughalsarai (Uttar Pradesh). In 1976-77, the Ghaziabad-Nizamuddin-New Delhi-Delhi track was electrified. On 1 July 1987, Ambala railway division was created by transferring 639 km tracks from Delhi Division and 348 km from Firozpur Division, and it became completely operational from 15 August 1988. 62% its are lies Punjab and the rest in Haryana, Himachal Pradesh, Uttar Pradesh, Rajasthan and Chandigarh. It has 141 stations, including UNESCO World Heritage Kalka Shimla Railway. In 1992-1995, Sabjimandi-Karnal sector was electrified. In 1994 December, the Delhi-Rewari railway line had double metre gauge tracks and one of the tracks was converted to broad gauge as a part of conversion of Ajmer-Delhi line. Within a few years, both the tracks from Sarai Rohilla to Delhi railway station were converted to broad gauge and all metre gauge trains stopped operating from Delhi station. In 1998-99, Ambala-Chandigarh sector was electrified. In 1999-2000, Chandigarh-Kalka. 21st Century On 1 April 2003, North Central Railway zone was created. By September 2006, the second metre gauge track from Sarai Rohilla to Rewari was also converted to broad gauge and all metre gauge trains stopped operating between Rewari and Sarai Rohilla (though the converted track was opened for public use only in October 2007). 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. In 2010-11 Rail Budget, Panipat-Meerut line 104 km survey was announced and the project implementation was approved in 2017-18 budget with an outlay of INR948 crore. In 2013, Chandigarh-Sahnewal line (also referred to as Ludhiana-Chandigarh rail link) was inaugurated. In 2013, the foundation stone for the shifting of Rohtak-Makrauli section of Rohtak- Gohana- Panipat line was laid. In 2013,