Full electrification of the main south Wales to London railway is in doubt as engineers on the £2.8bn project have an 'issue' electrifying the Severn Tunnel. The kit holding electric wires above the track in the four-mile (6km) tunnel is failing because of the salty conditions under the Severn Estuary. Network Rail has spent three years and what is thought to be close to £20m to prepare the tunnel for electrification. Specialists in electric rail have been brought in to help solve the issue.
After three years and £20m, there is still an "issue" electrifying the railway in the Severn Tunnel.