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Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page B12 of 25 10 Track Circuit Insulations Withdrawn Document Uncontrolled When Printed <strong>General</strong> <strong>Information</strong> on Track Circuits 10.1 Insulated Rail Joints Insulated rail joints (IRJs) are required to join rails together mechanically but not electrically. The Permanent Way Engineer is responsible for the installation and maintenance of all IRJs. 10.2 Point Equipment Apart from the IRJs, used to electrically separate sections of rail, the reliable operation of track circuits requires the provision of other insulations in particular circumstances. Any direct metallic connection between the two rails will be interpreted as a train and will cause the track circuit to fail occupied. At a set of points, there are many of these connections, which therefore need to be fitted with insulations, as shown in Figure B8, which is a typical example; there are, however, some regional variations. B12 RAILTRACK
<strong>General</strong> <strong>Information</strong> on Track Circuits Insulation Withdrawn Document Uncontrolled When Printed C Railway Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page B13 of 25 Insulation Insulation B A Soleplate The soleplate is formed from two metal plates secured together by a bolted connection at an intermediate position between the rails, which includes insulated ferrules, washers and plates to maintain electrical separation. Where the soleplate is extended to one side, as required for point machine operation, a second insulated connection is provided between the point machine and the nearest rail. B Permanent Way Stretcher Bars These connect the two point switches together and are formed from two separate pieces connected together with two bolts. The bolted connection includes insulation ferrules, washers and plates to maintain electrical separation. C FPL Stretcher Bar Insulation ferrules, washers and plates are fitted where the stretcher bar is connected to one of the point switch blades; usually that furthest from the drive mechanism. The design is such that the insulation can be fitted at either end of the stretcher bar, but should not be fitted at both ends. D Point Drive Rod Insulation is provided either separately, or is incorporated into the drive rod jaw connection onto the point machine. E Lock & Detector Rods Insulated bushes are fitted where the screwed end connections are attached to the switch extension pieces. Figure B8 RAILTRACK B13 D E A
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General Information on Track Circuits - RGS Online

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