NR NR/L2/SIG/11201/MOD X24 ISSUE 2 PDF

GENERAL DESCRIPTION

Where the number of trains exceeds the numbers of vehicles passing over the crossing it reduces the workload of signallers if the normal position of the barriers is lowered across the road. Such crossings require a means for a user at the crossing to inform the signaller that they require to cross. This gives rise to the name for this version of an MCB which shall be known as an "On Call Barrier" or "MCB-OC".