General Information on Track Circuits - RGS Online

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Railway Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page E2 of 52 3 Track Circuit Interrupters Withdrawn Document Uncontrolled When Printed <strong>General</strong> <strong>Information</strong> on Track Circuits The standard insulated track circuit interrupter assembly is shown on drawing BRS-SM 374, an extract of which is shown in Figure B11. Catalogue numbers are as follows: Description Catalogue No. Assembly complete to BRS-SM 374 : 86/44001 Taper pin, BRS-SM 411, 60mm : 86/44011 Body unit to BRS-SM 375 : 86/44003 Insulations to BRS-SM 376 : 55/27570 Item 1 Insulating bush : 55/25976 Item 2 Insulating washer : 55/28981 Item 3 Channel insulation : 55/27201 The interrupter is mounted on the stock rail, not the switch rail, by means of an M20 insulated bolt passing through a 28mm hole in the rail web. A second 28mm hole, 130mm from the first, may be provided to enable the wiring to be brought out towards the sleeper ends. The interrupter is positioned as near as possible to the switch toe, commensurate with maintaining a flangeway gap of not less than 70mm with the switch closed. Figure E1 gives the nominal positioning. The temporary repair of track circuit interrupters by means of wrapping the cable around the stock rail is forbidden. Refer also to Part D. POSITION OF INTERRUPTER E 2 R A I L T R A C K A Rail Type Switch Type Dimension 'A'(mm) 95 lb.Bullhead A 4180 B 4780 C 5900 D 7620 113 lb. Inclined A 4180 B 4955 C 6675 D 7635 E 10185 113 lb. Vertical A 4705 B 6125 C 6835 D 8255 E 11095 Figure E1
<strong>General</strong> <strong>Information</strong> on Track Circuits Railway Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page E3 of 52 4 Identification of Track Circuit Boundaries Where required, a plate may be fixed to the sleepers or to the lineside track circuit equipment to assist identification of track circuit limits. 5 Protection of Cross Track Cables Withdrawn Document Uncontrolled When Printed Wherever a track circuit boundary occurs in a tunnel, a plate bearing the track circuit name or number must be fixed to the tunnel wall on each side of the IRJ (or equivalent in the case of a jointless track circuit). 5.1 <strong>General</strong> Cross track tail cables and jumpers should be protected from damage, eg. by means of orange plastic pipe. This protection need not be continuous across the cess or six–foot, but should be used where tail cables pass under walkways. 5.2 Orange Pipe Installation Cut the pipes to length so that the ends are clear of the ballast shoulder. This helps to prevent ballast from entering. Restrict each pipe length to 3 metres maximum as long lengths of pipe will not move out of the way if struck by a tamper tine. However, in S & C areas it may be necessary to use longer lengths to give full protection across the sleeper bay. It is particularly important that the pipe is laid straight and centrally in the sleeper bay, and that holes for rail leads are as close to the rail as possible, in order to give maximum protection from tamping machines. Do not use the ballast to restrain sideways movement. Dig the pipe into a shallow depression in the ballast keep it visible but allow sideways movement if struck. Do not fill a pipe more than half full with cables. This reduces the chance of cable damage if the pipe is crushed by a tamper. If more cables have to be run, provide another pipe. Wherever possible, do not install a pipe in a sleeper bay adjacent to conductor rail ramped end to prevent the pipe being ignited by sparks from the collector shoe. To allow the Permanent Way Engineer maximum opportunity for tamping, do not position a pipe: • in a bay where there is a rail joint or weld, or in a bay adjacent to them; • in a bay which is less than 0.37 metres (1 foot 3 inches) wide, unless there is no other choice; • in a bay which already has an orange pipe or other obstruction, or in one adjacent to it. Always leave at least one clear bay between obstructed bays. If a pipe needs side holes for the exit of track connection cables: a) Cut the holes with a good quality 40 to 50 mm fixed diameter hole saw. Do not use other methods of making holes. Round off the sharp edges of the hole with a file or deburring tool. R A I L T R A C K E 3
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