Westlandsche Stoomtramweg-Maatschappij

was a tramway company that transported people and goods through the Westland area in the Dutch province of South Holland.

[citation needed] In 1886, the WSM purchased land at 's-Gravenzande at the end of the tram line to build waiting rooms for first and second class passengers, a goods office, and an official residence.

On October 1, 1965, the company name was changed to NV Westlandse Streekvervoer Maatschappij while retaining the initials WSM.

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 the 1920s the tram for passenger transport started to lose competition with all kinds of newly established bus services.

In December 1967, for tourists "nostalgic" journeys were made with two steam tram locomotives (18 and 30) from the Tramweg Foundation from Delft to Loosduinen and back.

In 1928, WSM buses started to provide local transport at an HTM rate to Loosduinen, which was annexed in 1923 by the municipality of The Hague.