The Glasgow Subway is the third oldest subway in the world, having opened on December 14, 1896. Only the systems in London and Budapest are older. The system is merely a 6.5 mile loop line that runs on both the north and south sides of the River Clyde. The entire route has two tracks, designated as the inner circle and outer circle, so trains are running in both directions. Although all the stations are below ground, the maintenance facility at Broomloan Road is above ground. Although the Glasgow Subway has never been extended since it opened in 1896, it was closed from 1977 until 1980 for a modernization project. The current rolling stock was manufactured during this modernization by Metro-Cammell. The original stock ran from the subway\'s opening in 1896 until the closure for modernization in 1977.