Trains have stopped running between Bristol's two main stations until mid November for engineering work.
Network Rail is laying a new track for two additional railway lines to reduce congestion and delays between Temple Meads and Parkway.
The construction will also affect services at Severn Beach via Clifton Down and Avonmouth.
Rail replacement buses will be running until Sunday 18th November.
Passengers travelling towards Bath Spa from South Wales, Bristol Parkway, Cheltenham Spa or Gloucester during the works will be diverted via Swindon instead of Bristol Temple Meads.
When work's complete there will be four tracks between the stations which is expected to run more frequent and punctual services from early 2019.
This upgrade will transform rail travel for passengers across Bristol.
Further work to connect the new track to the existing railway is expected to take place on the weekends of Saturday 24 and Sunday 25 November and Saturday 1 and Sunday 2 December.