The Delhi–Kalka line is a railway line connecting Delhi and Kalka. It connects to the UNESCO World Heritage Site Kalka–Shimla Railway.

Delhi Junction railway station is the oldest railway station in Old Delhi, Delhi, India. It is one of the busiest railway stations in India in terms of frequency. Around 250 trains start, end, or pass through the station daily. It was established near Chandni Chowk in 1864 when trains from Howrah, Calcutta started operating up to Delhi. Its present building was constructed by the British Indian government in the style of the nearby Red Fort and opened in 1903. It has been an important railway station of the country and preceded the New Delhi by about 60 years. Chandni Chowk station of the Delhi Metro is located near it.