| Route | tph | Operator |
|---|---|---|
| Brighton – Burgess Hill – Wivelsfield – Haywards Heath – Balcombe – Three Bridges – Gatwick Airport – East Croydon – London Bridge – Blackfriars – City Thameslink – Farringdon – St Pancras – Finsbury Park – Stevenage – Hitchin – Letchworth Garden City–Baldock – Ashwell and Morden – Royston – Cambridge | 2 | Govia Thameslink Railway |
| – Finsbury Park – Potters Bar – Hatfield – Welwyn Garden City – Welwyn North – Knebworth – Stevenage – Hitchin – Letchworth Garden City–Baldock – Ashwell and Morden – Royston – Meldreth – Shepreth – Foxton – Cambridge | 2 | Govia Thameslink Railway |
| Horsham – Littlehaven – Ifield – Crawley – Three Bridges – Gatwick Airport – Horley – Redhill – Merstham – Coulsdon South – East Croydon – London Bridge – Blackfriars – City Thameslink – Farringdon – St Pancras – Finsbury Park – Stevenage – Hitchin – Arlesey – Biggleswade – Sandy – St Neots – Huntingdon – Peterborough | 2 | Govia Thameslink Railway |