Future engineering work

PAGE LAST UPDATED: 17/10/2018 15:11. Update now

See details of routes affected by planned engineering works, including when they take effect, maps of the affected area, alternative timetables, advice for alternative travel and real-time updates.

Amended late night midweek service through the Severn Tunnel from Monday 20 until Wednesday 22 August

Start date
20/08/2018  00:00
End date
Route affected

Trains between Cardiff Central and Bristol Temple Meads

TOC(s) affected
Great Western Railway

Work on the signalling equipment is taking place between Severn Tunnel Junction and Patchway, closing 1 out of 2 tracks.

Monday to Wednesday

The 23:27 Cardiff Central to Bristol Temple Meads service will depart Patchway and beyond approximately 5 minutes later than normal.


The 22:45 London Paddington to Swansea and 23:30 London Paddington to Cardiff Central services will have increased journey times of up to 5 minutes between Patchway and Severn Tunnel Junction.

Check before you travel:

You can plan your journey using the National Rail Enquiries Journey Planner

You can find the location of your bus replacement by checking station signs or by searching for your station on our station information pages


Non folding bicycles are not allowed on rail replacement bus services at any time. Folding bicycles are allowed if fully folded. For more information, please see here.

Project Information:

Signals tell the train driver when it is safe to continue ahead. Renewal and maintenance of this equipment may be required to replace old signalling equipment or to improve the positioning of the signals. This allows more efficient use of that area of the railway network, thus trains will run safely and reliably. This may also permit more trains to operate and/or allow faster journey times.