Network Rail will be working on the tracks to the north of Bristol Temple Meads affecting train services from Sunday 27 December until Sunday 10 January.
This is to enable a new signal gantry to be installed as part of a major track remodelling scheme to increase capacity and reduce congestion in the area.
Buses will replace all trains from Bristol Temple Meads to Bristol Parkway, Bath Spa and Severn Beach on Sunday 27 December.
From Monday 28 December to Sunday 10 January timetables in the Bristol area will be amended as platforms 3-6 at Bristol Temple Meads will be out of use. Please check all journeys carefully before travelling.