may access the north side of Reading station via a single track underpass. Prior to the 2012 Reading resignalling scheme, trains served platforms 4a and 4b, on the site of the current 5 and 6, was via a short single track section, which severely limited capacity. As part of the resignalling scheme, an additional platform has been provided for North Downs Line services along with dual track access to the resulting three platforms. As a consequence platforms have been re-numbered as 4 (new), 5 (former 4b) and 6 (former 4a). Capacity restraints at Redhill were also improved by the creation of a new platform and improvements to track work south of the station, as part of the Solum Regeneration project. A new platform at Gatwick Airport was officially opened in February 2014. The new platform at Redhill opened in 2019 from which time additional services were planned to travel through to Gatwick Airport. Network SouthEast originally planned to electrify the whole route, with a completion date of 1993 being published, but these plans were dropped. Current passenger services and rolling stock The main services on the line are provided by Great Western Railway using Class 165 and Class 166 Network Turbo diesel multiple units. Hourly semi-fast services run from Reading to and there is a half-hourly stopping service between Reading and Redhill. At Redhill the Gatwick Airport services reverse to head south along the Brighton Main Line. Until 1994, the stopping services continued to , but the line between Redhill and Tonbridge was electrified in 1993. Trains on this section are now operated (by Southern) as a shuttle service between Redhill and Tonbridge only. Additional services on the North Downs Line are provided by South Western Railway between Reading and Wokingham (trains to/from ) and between Ash and Guildford (trains to/from or ). Southern operates services between Reigate and Redhill and onwards to London. Southern operate frequent services using Class 377s electric multiple units between Reigate and London Victoria, utilising the North Downs Line between Reigate and Redhill stations where access can then be found onto the Brighton Mainline at Redhill. Passenger services and rolling stock before privatisation Steam traction was replaced by 3R (Class 206) DEMUs on 4 January 1965. The new trains consisted of two 6S (class 201) coaches from the Hastings Line coupled to adapted 2EPB driving trailer units. As a result of the visible difference in