Great Western Railway is launching its new timetable in 100 days including a non-stop train from Bristol to London.
The changes, which take place on December 15, are the biggest to the network timetable since 1976.
They include more services and faster journey times, including a non-stop train from Bristol Parkway station to London Paddington that takes 68 minutes.
There will also be three extra trains between Bristol Temple Meads and London Paddington in the morning and evenings (three an hour rather than two).
And the journey between the capital and Temple Meads will be cut to one hour 19 minutes - 17 minutes faster than now.
Two additional services in the morning and evening peaks will also operate from South Wales to Bristol Parkway and then direct into London Paddington.
From May 2020 GWR plans to extend these extra peak time trains to operate throughout the day.
The changes follow the electrification of the line and the use of GWR’s new Intercity Express Trains (IETs).
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GWR managing director Mark Hopwood said: “We have been working hard behind the scenes to prepare to implement the biggest timetable change on this network since 1976, enabling us to take advantage of the full benefits that new Intercity Express Trains are bringing.
“In providing more frequent and quicker journeys our new timetable will for the vast majority of users quite literally mean ‘all change please’ and we are looking forward to publishing further details soon.”
The Severn Beach line, which was the first to get the newer, longer Turbo trains in 2017, will also see services extended through to Severn Beach on Sundays.
West of England metro mayor Tim Bowles said: “This is great news for the West of England and will help people switch from cars to public transport , reducing congestion and improving the air we breathe.
“The new timetable will support the new rail services we have planned across the region through MetroWest and it’s great to see even more investment in both track and train.”
The plans are subject to final industry approval including from Network Rail . They are expected to be published on 22 September.
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