Electrification 2018

Network Rail will be installing overhead line equipment in 2018 as part of the electrification of the line between Cardiff Central and London Paddington.

The first section, between Didcot Parkway and Swindon, will affect services at weekends between March and May.

The next section of work will be between Swindon and Bristol Parkway – planned for summer 2018.

The last section will be between Cardiff Central and Bristol Parkway – due to be completed by December. 

During these periods, some trains will be diverted; while others will be replaced by buses. Some journey times may be longer than normal.

Didcot Parkway to Swindon

No trains between Didcot Parkway and Swindon on the following weekends:
  • Saturday 17 and Sunday 18 March
  • Saturday 24 and Sunday 25 March
  • Saturday 14 and Sunday 15 April
  • Saturday 26 and Sunday 27, plus Monday 28 May (public holiday) 


  • London Paddington to Cardiff Central or Swansea, high-speed trains will be diverted and won’t call at Didcot Parkway or Swindon, and some will call at Patchway, instead of Bristol Parkway
  • London Paddington to Bristol Temple Meads, Weston-super-Mare and Taunton, high speed trains will be diverted, and won’t call at Didcot Parkway, Swindon or Chippenham
  • between Chippenham and Bristol Temple Meads, shuttle services will run
  • between Cheltenham Spa and Kemble, shuttle services will run


Buses will replace trains between:
  • Reading and Swindon via Didcot Parkway
  • Swindon and Chippenham
  • Swindon and Kemble
  • Patchway and Bristol Parkway

Swindon to Bristol Parkway 

Network Rail will continue work during the summer, between Swindon and Bristol Parkway in June, July and August 2018.

More details will be available soon.

Cardiff Central to Bristol Parkway

Network Rail’s electrification programme continues between Cardiff Central and Bristol Parkway in October, November and December 2018.

More details will be available soon.

Replacement buses

  • we’ll use a mix of step-free buses and standard coaches
  • if you are mobility restricted, and your route involves a replacement bus, speak to a member of staff, or contact our Assisted Travel team
  • only folding bikes can be carried on replacement buses

Check your journey