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Railway Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page D12 of 20 Withdrawn Document Uncontrolled When Printed <strong>General</strong> <strong>Information</strong> on Track Circuits Examples of the application of this principle are shown in Figure D7. Figure D7 Other Yellow Bonds Y Y Y Switch Reinforcement Yellow Bond D12 RAILTRACK Y 13.2.2 Switch Reinforcement Yellow Bonding Wherever the rail designated to require yellow bonding passes through a set of point switches, its continuity is to be strengthened by a “Yellow Bond” as shown in Figure D8. Installation for traction rails is the responsibility of the Electric Traction Engineer, and for non–traction rails is that of the the Signal Engineer. Figure D8 Common Rail Through Points 13.3 Bonding Configurations In order to avoid repetition whilst clearly identifying requirements, it is useful to define the four bonding configurations and associated bonding standards which can be used for particular cases: 13.3.1 DRDS (Double Rail/Double Series) This is where each track circuit is fully isolated from its neighbours by IRJs in both rails or tuned zones and each rail of the track circuit is series bonded OR Y Y
Withdrawn Document Uncontrolled When Printed <strong>General</strong> <strong>Information</strong> on Track Circuits Railway Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page D13 of 20 throughout except for permissible spurs (see 13.4). In electrified areas, there are no other electrification related bonds from either rail other than via the centre connection of impedance bonds. Non–electrified Lines - Standard jumper bonds to both running rails. Electrified Lines - Traction jumper bonds to both running rails. 13.3.2 DRSS (Double Rail/Single Series) This is where each track circuit is fully isolated from its neighbours by IRJs in both rails, and one rail of the track circuit is series bonded throughout except for permissible spurs (see 13.4). The other rail of the track circuit contains elements of parallel bonding. Non–electrified Lines - Standard jumper bonds to the series bonded rail and to the true series bonded elements of the other rail. Electrified Lines - Not applicable Yellow standard bonds to interconnect the parallel elements. 13.3.3 CR Class (Common Rail) This is where each track circuit is isolated from its neighbours by IRJs in one rail only (the signal rail), and that rail is series bonded except for permissible spurs (see 13.4). The other rail is electrically common with adjacent track circuits and may have parallel bonded elements, but does not carry traction current. Non-electrified Lines bonded - Standard jumper bonds to the series Signal Rail. Yellow standard bonds to the common rail. Electrified Lines 13.3.4 SR (Single Rail) - Not Applicable This is where each track circuit is isolated from its neighbours by IRJs in one rail only (the signal rail), and that rail is series bonded except for permissible spurs (see 13.4). The other rail is electrically common with adjacent track circuits and forms part of a mesh carrying traction current. Non–electrified Lines - Not applicable Electrified Lines 13.4 Permissible Spurs - Standard jumper bonds to the signal rail. Yellow traction bonds to the traction rail. This clause covers the permissible arrangements for parallel bonded spur sections of an otherwise series bonded track circuit section. Parallel bonded spurs on common/traction rail sections are not separately identified, since they are covered by the general requirements for bonding of such rails. Spurs up to 13m, measured from the first joint or weld of a crossing, shall be permitted as shown in Figure D9. provided that there is a maximum of one fishplated joint between the series bonded rail and the end of the spur, and that this joint is properly bonded. Spurs up to a maximum of 60m, measured from the first joint or weld of a crossing, shall be permitted, provided they are yellow bonded to the parent series rail. RAILTRACK D13
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