The Ashford-Brighton service, as well as peak-time Ashford-Rye and Ashford-Hastings shuttle services, are nearly always operated by the two-car Class 171/7; the four-car Class 171/8 units occasionally appear on the route during special events such as the Rye bonfire celebrations.
The Uckfield-London Bridge and Uckfield-Oxted services use both the two-car and the four-car units.