Page 190 - IRSEM_Main Book

Para no: 7.4.11 Annexure: 7-A1

Extract from “Rules for the Opening of a Railway Lines” for Isolation (Rule 36)

35. Junctions: ………

36. Provisions for isolations at stations:

(1) The speed of trains running through stations shall be governed by the General Rules for
all open lines administered by the railway administrations, both Government and the
non-Government railways and shall be subject also to the restrictions relating to
standards of interlocking prescribed in the Signal Engineering Manual.

(2) At no station at which isolation has not been provided through running trains shall be
permitted unless the conditions laid down in the second paragraph of rule 4.11 of the General
Rules are complied with.

(3) At any station where there is a speed restriction for through running trains different
from neighbouring stations, a speed restriction board should be erected at the first
approach signal or where no signals are provide, at full braking distance outside the first
facing point.

(4) In order to maintain safety for through running, points for trap sidings must not be
inserted in the main line or through line, except under approved Special Instructions in
accordance with the Signal Engineering Manual, Part I.

(5) All passenger running lines shall be isolated from all goods lines or siding connected
thereto.

(6) All goods running lines may be isolated from all sidings connected thereto.

(7) It is not necessary to isolate one goods receiving line from another.

(8) Isolation may be accomplished by –

(a) Connection to another line or long siding;
(b) The provision of short dead end siding; or
(c) The provision of trap.

Note: (i) Whichever may be the method for isolation, a starter signal shall be provided,
except when omitted under approved special instructions.

(ii) When a trap is provided, the trap switch should be located with the heel of the switch in
rear of the fouling mark and preferably on the straight. The switch should be in the rail
away from the line to be protected.

(9) The various methods of isolation are illustrated in the diagrams given in Appendix A
attached to these rules and the following instructions shall apply to their use in the case of
running lines, namely :-

Chapter 7: Essentials Of Signalling Page 157 of 535