/ From Sunday 19 May - Saturday 14 December 

Monday to Friday
• An additional 29 trains will operate every weekday with an additional service each hour in both directions between Cambridge and Brighton, doubling the frequency of this service at peak times and throughout most of the day. These services will call at stations on the Cambridge line, Hitchin, Stevenage, through central London and on to Brighton via Gatwick Airport. 

• With the addition of these services, from Monday 20 May we will be operating 20 trains per hour through central London stations on weekdays.

• Other Thameslink services will continue to operate to the current timetable, with additional stops at some Cambridge route stations. There are minor changes to other services, with some trains departing earlier at stations from Royston to Hitchin.

Saturdays
• An additional 180 services will operate on Saturdays.

• There will be a new hourly service between Cambridge and Brighton. In addition the service frequency will be doubled on the following routes with: two additional services operating per hour between Bedford and Gatwick Airport and one additional service per hour between Kentish Town and Rainham.

• Other Saturday services will continue to operate to the current timetable.

Sundays
• An additional 100 services will operate on Sundays.

• There will be a new hourly service between Cambridge and Gatwick Airport. An additional service will also operate each hour on the following routes: between Bedford and Gatwick Airport, Bedford and Three Bridges and between Kentish Town and Rainham. This doubles the frequency of trains between Bedford and Gatwick Airport and Kentish Town and Rainham.

• In the afternoon two services per hour will now operate between Sutton and St Albans City. 

Please check for alterations before you travel, as engineering work often takes place at weekends.