With the opening of the extension to Robertsbridge, there were three trains a day, with two on Sundays. These were augmented by an additional train daily when the extension to Bopeep Junction opened. In 1860, there were seven up trains and six down trains daily; Hastings to London via taking two hours. From 1861, Cudworth 2-2-2 "Little Mail" class locomotives were introduced. In 1876, the Sub-Wealden Gypsum Co built a long line from a junction south of Mountfield Tunnel to a gypsum mine located in Great Wood, Mountfield. This line was still in operation as of 2007. Bogie carriages entered service on the line in 1880. In 1890, the winter service was eleven trains each way, of which five were fast. An additional two trains daily operated between Tunbridge Wells and Wadhurst. By 1910, this had increased to twenty trains each way, of which twelve were fast, plus the extra two Wadhurst services. Four trains ran on Sundays. The service was reduced during World War I, but Sunday services had increased to seven by 1922.