on 27 December 2008, when its area of control was transferred to the new West of Scotland Signalling Centre (WSSC) at Cowlairs. The NX panel is to be preserved. The station is currently signalled by two Westinghouse Westlock Interlockings which are controlled via an Alstom MCS control system. Railway electrification Overhead power lines began to appear on the high-level platforms in the early 1960s under British Railways. Firstly came 6.25 kV AC overhead power lines from the Cathcart Circle Line electrification scheme, which started on 29 May 1962. During this period, the old 1879 bridge over the River Clyde was removed and the railway lines were rearranged. This was followed by the 25 kV AC overhead-power-lines electrification of the Glasgow and Paisley Joint Railway and the Inverclyde Line to Gourock and Wemyss Bay, completed in 1967. The WCML northern electrification scheme started on 6 May 1974. Part of the Cathcart Circle was upgraded to 25 kV AC supply in 1974, to provide a diversionary route; the whole of the Cathcart Circle route was later upgraded to that supply. Plans to electrify other routes, such as the Whifflet Line, as part of a scheme to improve rail services in Scotland were completed in November 2014. Late-20th century developments Low-level station Closure Services through the Low-Level station, initially generous, had been greatly reduced due to competition with the extensive and efficient Glasgow Corporation tram system well before their withdrawal on 3 October 1964 under the "Beeching Axe". The trams themselves had been replaced by buses by 1962. Re-opening In 1979, part of the low-level line was electrified and the Low-Level station was re-opened as the Argyle Line of the Glasgow suburban railway network. It consisted of a single island platform, numbered as Platforms 14 and 15 (later renumbered to 16 and 17 respectively when the project to re-signal and add two additional platforms to the higher level took place in 2008). Initially services were provided by Class 303 and Class 314 units. The latter were built specifically for this service. Following the withdrawal of the Class 303 units, the service was provided by Class 318 and Class 334 "Juniper" units. Class 320 units were intended to be used on the route, but due to the position of the original driver's monitors for checking doors, this proved impossible. Therefore, these units were restricted to the North Clyde Line. This changed in 2011 with