Great Western Railway services have been suspended between Swindon and Gloucester due to a landslide at Kemble.
Tickets being accepted on CrossCountry services and Stagecoach buses.
GWR says trains may be diverted via Bristol Parkway and replacement buses are being arranged.
The Swindon to Kemble rail line has re-opened as a double track for the first time in nearly 50 years.
It's taken 18 months to install the extra line at a cost of £45 million.
But there won't be any extra trains on the route until at least 2017.
A Gloucestershire airport company is being prosecuted on health and safety charges following the death of a fire chief in a gas cylinder explosion.
Kemble Air Services Limited will stand trial on two charges of failing to make suitable and sufficient risk assessments at the former RAF Red Arrows base at Kemble, near Cirencester.
Fire Chief at Kemble airfield Steve Mills died in April 2011 when a giant gas cylinder suddenly discharged as he was moving it.
The force of the gas gushing from the heavyweight cylinder caused it to spin around, hitting 45 year old Mr Mills on the head and killing him instantly.
The railway line between Swindon and Kemble is due to reopen today. It's been closed for three weeks and will initially re-open as a single line operation. It's part of a £45 million project to electrify the Great Western Main Line.
It's taken 600 staff to create 12 miles of additional track.
Services from Cheltenham, Gloucester and Stroud to London Paddington have all been disrupted because of the works.
The old line should be open from tomorrow (Monday 1 September), and engineering work on the new one will carry on alongside. More details here.
Prince Charles took a break from his new duties as a grandfather today to visit Kemble in Gloucestershire.
He was there to open a new garden at the railway station which has been redesigned by a local company after it became derelict.
While he was there - he met a young boy with a name that's proving popular.
Our Gloucestershire correspondent Ken Goodwin reports:
This is Oliver and Daniel Horne from Cirencester, who patiently waited for Prince Charles to arrive at Kemble Station.
The brothers made a card for the Duke and Duchess of Cornwall congratulating them on becoming grandparents.
They also presented the Prince Wales with a cuddly toy for the new Prince George of Cambridge.