The 130-year-old Severn Tunnel closed for six weeks from September 12 to allow for the fitting of more than eight miles of overhead electric supply bar that will power the new Class 800/801IEP units that will be used on Paddington to Cardiff services from 2019.Prior to the closure, a significant amount of preparation work had already been completed. This included the removal of 40 tonnes of soot that had built up in the tunnel crown, inspection of the brick work, removal of four miles of redundant cable, the drilling of more than 12,000 holes using a custom-made drilling rig, and the installation of in excess of 6,000 cable cleats.
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