transport started to lose competition with all kinds of newly established bus services. In 1923 the company decided to set up its own bus service. Passenger transport by tram then declined rapidly. The emphasis in the rail lines was on transporting goods, especially horticultural products and coal for heating the greenhouses. In October 1932 the entire passenger transport by tram was terminated by the WSM. Only one year during the Second World War (1942–43), the WSM still transported passengers by rail. At the end of the 1940s, the operation of the railways of the WSM was taken over by the Dutch Railways NS, now the parent company of the WSM. There were diesel locomotives, first from the series NS 160 and later from the NS 450 series. In 1965 the goods service was completely taken over by the NS. 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. The last route between Den Hoorn and Delft was definitively closed in February 1970. The own bus services operated by the WSM since 1923 proved to be a success. 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. After October 1932 only buses were used for passenger transport. In 1941 the WSM took over the regular services with permits and part of the bus staff from the watering bus company VIOS, which continued as an independent coach company. The WSM also became a wholly owned subsidiary in 1941. Rail transport in South Holland Railway companies of the Netherlands Railway companies established in 1881