Flood warnings remain in place across Wiltshire after heavy rainfall on Friday.
Swindon was badly affected by rain on Friday
Swindon was worst hit by the torrential downpours, with the fire service rescuing more than 50 people from their flooded homes.
The A420 east of Swindon remains closed at the Acorn Bridges: tarmac has been washed away and vehicles are floating under the bridges, said police.
Rail travellers are advised to check with train companies before travelling.
First Great Western said it was currently operating a reduced and amended service on many routes.
There will be no Saturday services operating between Reading and Westbury, Oxford and Worcester/Hereford, and Swindon and Cheltenham Spa
The company is unable to operate between Swindon, Kemble, Stroud, and Stonehouse, and could not offer alternative transport.
Short notice alterations and cancellations are expected and travellers should check with National Rail Enquiries on 08457 484950 before setting off.
Friday travel tickets would be valid for travel on Saturday.
"Swindon has seen a month's rainfall in less than a half a day," said weather expert Richard Angwin.
"Although the rain was accurately forecast there is relatively little that can be done to cope with such a quantity of rain falling in this time."
Train services have been disrupted by the rain pic by Charles Fair
Many roads were reported to be at a standstill on Friday: the Commonhead roundabout was under 1ft (30cm) of water and the Bruce Street bridges were closed.
Wiltshire Fire and Rescue service said it had dealt with an unprecedented number of calls to severe flooding incidents in Swindon, with many people taking refuge in the town's Oasis centre.
Fire crews from RAF Lyneham provided assistance in dealing with flooding incidents close to the airbase.