|Locale||Delhi, Haryana, Chandigarh|
|Track length||267 km (166 mi)|
|Track gauge||1,676 mm (5 ft 6 in) broad gauge|
|Electrification||25kV 50Hz AC OHLE in 1992-2000|
|Operating speed||up to 130 km/h|
The Delhi–Ambala–Kalka line was opened in 1891.
The 2 ft (610 mm) wide narrow-gauge Kalka–Shimla Railway was constructed by Delhi–Ambala–Kalka Railway Company and opened for traffic in 1903. In 1905 the line was regauged to 2 ft 6 in (762 mm) wide narrow gauge.
Sabjimandi–Karnal sector was electrified in 1992–1995, Karnal–Kurukshetra sector in 1995–96, Kurukshetra–Ambala in 1996–98?, Ambala-Chandigarh in 1998–99 and Chandigarh–Kalka in 1999–2000.
Ambala has a diesel loco shed for minor maintenance of WDS-4 shunters. The locos are sent to Shakurbasti for major maintenance or repairs. Kalka has a narrow gauge diesel shed for the maintenance of ZDM-3 and ZDM-5 narrow gauge diesel locos.
The Delhi–Panipat–Ambala–Kalka line is classified as a ‘Group B’ line which can take speeds up to 130 km/h.
In 1952, Eastern Railway, Northern Railway and North Eastern Railway were formed. Eastern Railway was formed with a portion of East Indian Railway Company, east of Mughalsarai and Bengal Nagpur Railway. Northern Railway was formed with a portion of East Indian Railway Company west of Mughalsarai, Jodhpur Railway, Bikaner Railway and Eastern Punjab Railway.
- "IR History: Early Days II (1870-1899)". IRFCA. Retrieved 2 August 2013.
- "Engineer" journal article, circa 1915, reprinted in Narrow Gauge & Industrial Railway Modelling Review, no. 75, July 2008
- "History of Electrification". IRFCA. Retrieved 2 August 2013.
- "Sheds and workshops". IRFCA. Retrieved 2 August 2013.
- "Chapter II – The Maintenance of Permanent Way". IRFCA. Archived from the original on 3 December 2013. Retrieved 2 August 2013.
- "Indian Railways Passenger Reservation Enquiry". Availability in trains for Top 100 Booking Stations of Indian Railways. IRFCA. Archived from the original on 10 May 2014. Retrieved 2 August 2013.
- "Geography – Railway Zones". IRFCA. Retrieved 25 January 2014.