Inside the decades-old signal box being upgraded

A 1960s signal box is being upgraded in Gloucester leading to nine days of disruption on trains in the city.

Great Western Railways spokesperson Chloe Coglan said "a comprehensive bus replacement service" had been planned to keep passengers moving.

The electrical system upgrade will involve replacing some 10,000 wires - the equivalent of 12 miles of wiring. We've been inside for a look.

Video journalists: Edward Rowe and Kathryn Emerson