This route was later shortened by the opening of the Severn Tunnel.

The bridge predated the construction of the Severn Tunnel, a dozen miles or so downstream, by seven years.

These two continued in service until the Severn Tunnel was opened in 1886.

Take time to gather your breath because now the train disappears into the dark immensity of the Severn Tunnel.

A diversionary route exists if the Severn Tunnel is closed.

The line could then be used to partially relieve the Severn Tunnel.

In 1879 work began on the Severn Tunnel, which was opened in 1886.

Cars could also be transported through the Severn Tunnel.

He was also the instigator and first engineer of the Severn Tunnel.

This locomotive was sold to the engineers constructing the Severn Tunnel.