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Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page D2 of 20 3 Track Circuit Nomenclature Withdrawn Document Uncontrolled When Printed <strong>General</strong> <strong>Information</strong> on Track Circuits e) In a.c. electrified areas (excluding the former Southern Region), all rail to impedance bond connections and connections between impedance bonds on the same track. f) In dual a.c./d.c. and d.c. electrified areas (excluding the former Southern Region), the responsibility for impedance bond connections is subject to special arrangements between the Signal and Electric Traction Engineers. g) On the former Southern Region, impedance bond connections for track circuit only purposes. h) All track circuit rail connections. i) Identifying the need for Yellow Bonding and specifying which bonds are to be yellow. The Electric Traction Engineer is responsible for the design of: a) All fishplate bonds in d.c. or dual a.c./d.c. traction rails. b) All jumpers bonds between separate sections of traction rails and between the centre connection of impedance bonds in different tracks. c) On the former Southern Region, rail to impedance bond connections for traction purposes. d) All other permanent traction related bonding. 2.4 Adjacent Lines In all cases where lines run adjacent to or cross each other, but are not physically connected, all these lines must be represented on the bonding plans and the bonding plans cross referenced to each other. Identification of individual track circuits is to be in accordance with Standard Signalling Principle No. 54 and must be shown on plans at convenient intervals within the respective track circuit. To avoid confusion with other plan annotation, the following Track Circuit designations are to be avoided: B, F, I, N, O, R, Q, T, CL, OL, HVI, RB, RN, RR, RT, RX, TB, TC, TF, TFR, TI, TJ, TN, TO, TR, TX, VT, IBJ, IRJ, OCC. D2 RAILTRACK
<strong>General</strong> <strong>Information</strong> on Track Circuits 4 Choice of Track Circuit Type Withdrawn Document Uncontrolled When Printed Railway Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page D3 of 20 There are a number of design features of track circuits which constrain choice for a given application: a) The need to detect vehicles on poor rail surfaces. b) The need or otherwise to avoid insulated rail joints. c) The need for immunity to a.c. and/or d.c. traction interference. d) The need to achieve maximum reliability at economic cost. e) The need to track circuit through complex S & C. The Figure D1 summarises the key attributes and limitations of each type of track circuit. CAUTION: Although general precautions and limits that provide compatibility between rolling stock and track circuits, have been included in the Train Detection Handbook Codes of Practice, these are not comprehensive and special conditions may apply to certain routes to permit the operation of rolling stock. Where new types of rolling stock are to be introduced, existing constraints will require reassessment, as to their adequacy. RAILTRACK D3
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General Information on Track Circuits - RGS Online

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