Engineers on London Underground’s Jubilee Line are having to manually grind miles of track to allow new trains to use old rails.
The problem affects 12 miles of worn track between Stanmore and Charing Cross. If grinding is not carried out, the wheels of 26 recently delivered computer-controlled trains, costing £4m each, could press too tightly against the rails and climb off the tracks.
Grinding the rails’ inner edge removes the risk, but causes a loud screeching noise. This wears off in 3 4 weeks.