The DelhiâÂÂKalka line is a railway line connecting Delhi and . It connects to the UNESCO World Heritage Site KalkaâÂÂShimla Railway.
The DelhiâÂÂPanipatâÂÂAmbalaâÂÂKalka line was opened in 1891.
The -wide narrow-gauge KalkaâÂÂShimla Railway was constructed by DelhiâÂÂPanipatâÂÂAmbalaâÂÂKalka Railway Company and opened for traffic in 1903. In 1905 the line was regauged to -wide narrow gauge.
Sabjimandi (Delhi)âÂÂPanipatâÂÂKarnal sector was electrified in 1992âÂÂ1995, KarnalâÂÂKurukshetra sector in 1995âÂÂ96, KurukshetraâÂÂAmbala in 1996âÂÂ98, AmbalaâÂÂChandigarh in 1998âÂÂ99 and ChandigarhâÂÂKalka in 1999âÂÂ2000.
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 DelhiâÂÂPanipatâÂÂAmbalaâÂÂKalka line is classified as a âÂÂGroup Bâ line which can take speeds up to 130 km/h.
Delhi, Panipat, and on this line are amongst the top hundred booking stations of Indian Railway.
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.