Extra Thameslink services between Brighton and Cambridge are set to be introduced next week.
Rail operator Govia Thameslink Railway says passengers on the route will benefit from an extra 2,000 seats to and from the capital at peak times in the morning and evening.
From Monday (May 20), Thameslink will be doubling the frequency of the Brighton-Cambridge cross London service so two trains an hour will run in each direction during the week.
In total, 31 extra services will run on weekdays, 13 of them in the peak and 29 of them on Thameslink with two extra off-peak Gatwick Express services.
Weekend Thameslink trains also receive a significant boost with 180 extra services on Saturday and 100 extra on Sunday.
These are a combination of reinstated services, such as on the Bedford Main Line which returns to four trains per hour, new trains including Cambridge to Brighton on Saturdays and Cambridge to Gatwick on Sundays and a doubling of the trains from Rainham via Dartford and Greenwich both Saturday and Sunday.
In direct response to customer requests, some weekday peak services will also make additional stops at places such as Preston Park on Gatwick Express and Hassocks on Southern.
Patrick Verwer chief executive at GTR, said: “Thameslink’s new service between Cambridge and Brighton has been really well received by passengers. By doubling its frequency we’ll create seats for 2,000 more commuters each morning and evening and provide a further boost to the economies of these two important cities.
“Leisure travellers will love the new service too: we’ll have half-hourly trains from the Cambridge route direct to London and Gatwick, and Thameslink will be much better at the weekends.
“We already have 400 more services a day than this time last year and punctuality on GTR is the best it has been for four-and-a-half years with almost nine out of 10 trains arriving on time last month.”
Southern and Gatwick services are already running at intended levels so there are few changes.
Passengers should check online at National Rail Enquiries for full details.