ScotRail has announced that 12 extra services a day will be laid on from September 9 – the highest frequency ever run on a Sunday.
The half-hourly service has been extended due to increased demand and follows a successful trial during last year’s Edinburgh Festival.
The half-hourly Sunday service is currently only available between the hours of 1pm and 9.30pm.
ScotRail said the demand for more services on some routes is growing, with passenger numbers higher than any time since the 1920s.
A ScotRail spokesman said the new timetable had been drawn up in response to feedback from customers.
The move has been welcomed by business and tourism leaders from both cities.