The N.V. Westlandsche Stoomtramweg Maatschappij (W.S.M.) was a tramway company that transported people and goods through the Westland area in the Dutch province of South Holland. The company was founded on 30 July 1881 in Amsterdam and was established in Loosduinen from 14 December 1891 (since 1 July 1923 in the municipality of The Hague). Early history before 1920 Until 1885 the lines of the WSM were operated by the Hollandsche IJzeren Spoorweg-Maatschappij and then by the WSM itself. From 1923 the WSM also operated bus services and grew, since 1941 as a wholly owned subsidiary of the Dutch Railways, into the only regional transport operator in the Westland area. On October 1, 1965, the company name was changed to NV Westlandse Streekvervoer Maatschappij while retaining the initials WSM. The company became part of the transport company in Boskoop on 1 January 1969 and became NV United Streekransport Westnederland, which existed until 1994. The line network finally had a total length of 49.6 km. It was opened in phases over a 35-year period with the following milestones: The first route between The Hague Lijnbaan and Loosduinen was opened in 1882 and extended in 1883 via Poeldijk to Naaldwijk. In the same year the Poeldijk - Monster - 's-Gravenzande side branch came into use In 1888 a service came from Loosduinen to Kijkduin with only summer exploitation (only in 1923-24 it also rode in winter). In 1905 the line from 's-Gravenzande was extended to Hook of Holland. In 1907 the tram network was further expanded from Naaldwijk via Westerlee and De Lier to Maaslandse Dam. Five years later, the tram line reached Maassluis station via Maasland. Also in 1912 the connection from Maaslandse Dam via Schipluiden and Den Hoorn to Delft station was established. In 1917 an extra connecting arc was built at Maaslandse Dam, so that people could drive directly to and from all three directions. The choice of normal track proved to be justified, because the horticultural products did not have to be transferred and could be transported further by rail from the connections to the rail network in Delft and Maassluis. In Hook of Holland the goods were transferred on the ferry to Harwich in England. Moreover, the tracks of the WSM ran directly from most auctions in the Westland, for which transported a lot of cargo. Later history after 1920 In the 1920s the tram for passenger