numbers per annum on the high-level station having increased by 5.156 million since the first extension was completed in 1890. Passenger usage per annum in 1899 was 16.841 million on the high-level station and 6.416 million on the low-level station, a total of 23.257 million. The station is on two levels: the High-Level station at the same level as Gordon Street, which bridges over Argyle Street, and the underground Low-Level station. Between 1901 and 1905 the original station was rebuilt. The station was extended over the top of Argyle Street, and thirteen platforms were built. An additional eight-track bridge, the Caledonian Railway Bridge, was built over the Clyde, and the original bridge was raised by 30 inches (0.75 m). Bridge Street station was then closed. Also during the 1901–1905 rebuild a series of sidings was created at the end of Platforms 11 and 12 on the bridge over the River Clyde. These were named West Bank Siding, Mid Bank Siding and East Bank Siding. A dock siding – No. 14 Dock was created at the south end of Platform 13. Central Station has a spacious concourse containing shops, catering outlets, ticket offices and a travel centre. It is fronted by the Central Hotel on Gordon Street, designed by Robert Rowand Anderson. The station building also houses a long line of shops and bars down the Union Street side. The undercroft of the station is not open to the general public, except through regular official tours, and houses private car-parking and utility functions for the station and the adjoining Central Hotel. The station's famous architectural features are the large glass-walled bridge that takes the station building over Argyle Street, nicknamed the 'Hielanman's Umbrella' (Highlandman's Umbrella) because it was used as a meeting place for highlanders living in the city; and the former ticket office and information building. This was a large oval building, with the booking office on the ground floor and the train information display for passengers on large printed cloth destination boards placed behind large windows on the first floor by a team of two men. Underneath the "Umbrella" are a number of shops and bars. The former nightclub, theatre, gallery and restaurant complex, The Arches, was also located below the station. Central Hotel Central Station is fronted by the Central Hotel on Gordon Street. Adjoining onto the station concourse, it was one of Glasgow's most prestigious hotels in