§ 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.