HC Deb 14 October 1991 vol 196 c108W
Mr. Redmond

To ask the Secretary of State for Transport if he will instruct British Rail to ensure that wherever DC single track circuits exist on non-electrified lines, urgent steps should be taken to reinforce the common rail bonding by provision and maintenance of alternative paths to assure its complete commonality under all conditions; and if he will make a statement.

Mr. Freeman

This is already one of several remedial measures which form part of BR's programme of modifications to DC single-rail track circuits on non-electrified lines. Any alterations to safety critical systems must be made methodically, following a procedure involving rigorous and fully documented checking and testing.