Chipping Sodbury Tunnel sits on the South Wales Main Line

South Wales Main Line

The South Wales Main Line , originally known as the London, Bristol and South Wales Direct Railway or simply as the Bristol and South Wales Direct Railway, is a branch of the Great Western Main Line in Great Britain...

. It was constructed around 1900 for the South Wales and Bristol Direct Railway and runs some 2½ miles (4 km) west of Badminton railway station

Badminton railway station

Badminton railway station is a closed railway station in Gloucestershire, England. As well as Badminton it served the village of Acton Turville.-History:...

 and Chipping Sodbury Yard.

The tunnel is constructed with an arch brick lining and measures some 27'6" across and 20'9" high. It slopes at a 1:300 gradient from Badminton

Badminton, Gloucestershire

Badminton, Gloucestershire, is a village in England famous for its horse trials, which take place in early May each year in the grounds of the Duke of Beaufort's residence, Badminton House...

 falling in a westerly direction towards Chipping Sodbury

Chipping Sodbury

Chipping Sodbury is a market town in the county of South Gloucestershire, south-west England, founded in the 12th century by William Crassus . The villages of Old Sodbury and Little Sodbury are nearby...

.

The tunnel is prone to flooding and it is estimated that the route via the tunnel is closed an average of 24 times per annum, resulting in the cancellation and diversion of 50 passenger services and 40 freight services.

Coordinates

• Western end - 51°31′54"N 2°21′30"W
• Eastern end - 51°31′47"N 2°18′00"W