In December 1896, the Glasgow District Subway Company opened a 'subterranean railway' - or 'subway' - with two circular tunnels which ran for nearly seven miles to serve 15 stations. Designed and engineered by David Morton, it was unique in that it was the world's only underground passenger transport system with a cable between each track to haul the trams. It was purchased by the Glasgow Corporation in 1912 and electrified in 1934. It is now part of the Strathclyde Transport system and is still a convenient and widely used means of transport within the city. A replica of part of the subway and carriages are on display at the Museum of Transport, Kelvingrove.