Chippenham train station was left in darkness after a power failure a couple of hours ago.
First Great Western is asking people to take care getting on and off trains, though emergency lighting has been put out.
The power cut means the ticket office will be shut until the end of the day.
Trains are still running, though with delays, and passengers are asked to buy tickets on board if no machine is available.
Delays of up to half an hour should be expected as flooded lines between Swindon and Bristol Parkway mean trains are being diverted via Bath Spa.