Kalka is a small town in Haryana, India, known for its railway station, which is the northern terminal of the Delhi-Kalka line constructed in 1898. The Kalka-Shimla railway line includes several notable stations such as Dharampur, Shoghi, and Tara Devi, each offering unique attractions and steep gradients. Despite high construction and maintenance costs, the railway remains a popular route for visitors traveling to Shimla.