The Simla slopes were surrendered to the British through a progression of exchanges with the Raja of Keonthal. In its initial days, Simla, similar to its adjoining slope station, Kasauli, was utilized as a sanatorium. The chilly climate, it was accepted, helped in recuperating from long haul ailments. It likewise gave break from the normally hot and sticky conditions in the fields. The British utilized the Hindoostan-Thibet Road and the Kalka-Simla Railways to travel. The Hindoostan-Thibet Road was begun under the aegis of Lord Dalhousie in 1850, while the Kalka-Simla rail line was practical just from 1903. Before these, making a trip to Simla from the capital city of Calcutta was a tiring cycle which would have involved rail and truck travel.