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 an 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.