Train bosses said London journeys could be cut by up to 15 minutes
A shake-up of Nottinghamshire train services has seen Sunday services restored to one line after 40 years.
Extra trains are on the Nottingham to Worksop Robin Hood line for the first time since the 1960s as part of a new timetable from East Midlands Trains.
Campaigners calling for the move had collected more than 10,000 signatures.
The new timetable also promises faster services to London, more seats at peak times and more services earlier in the morning.
David Horne from East Midlands Trains said the Robin Hood service had returned with help of the local authorities and in response to public demand.
He said: "It's been a lot of work by Nottinghamshire County Council and Nottingham City Council and the users of the line to get a Sunday service on the line, so we are delighted.
"It is the councils who helped us to have this service because they are providing some of the funding we need and I think it is great the service is returning."
The company said upgrades of track and trains, along with more efficient use of stock, would see London journeys cut by between 10 and 15 minutes, and between 700 and 2,000 extra seats available on weekdays.
Paul Fullwood, from the watchdog Passenger Focus, said the regional changes were a step in the right direction.
He said: "There will be many benefits for passengers and passengers will welcome the changes that have come in.
"I hope East Midlands Trains can deliver this timetable reliably and punctually and then can go on and try to plug some of the other gaps in the service we have identified and create an even better timetable going forward."