Severn Tunnel closure: A look at the work in numbers

The Severn Tunnel is due to close for nearly six weeks from September, causing disruption for rail users.

Work to prepare for the £2.8bn electrification project - designed to speed up journeys between London and south Wales - will cause the longest closure of the tunnel for at least 50 years.

Rail users will be diverted via Gloucester or will use replacement buses.

The tunnel is to shut on 12 September and will reopen on 21 October.