Page 188 - IRSEM_Main Book

S.No Notes for Table 3
1 Isolation: Isolation is not compulsory. Extract from “Rules for Opening of Railway Lines – Rule 36” is given below
(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 the rule 4.11 of the General Rules are complied with.

Extract of GR 4.11. Limits of speed while running through stations.-

(1) No train shall run through an interlocked station at a speed exceeding 50 kilometers an hour or such less speed as may be prescribed by
approved special instructions unless the line on which the train is to run has been isolated from all other lines by the setting of points or other
approved means and interlocking is such as to maintain this condition during the passage of the train.
(2) In every case in which trains are permitted to run through on a non isolated line, all shunting shall be stopped and no vehicle unattached to
an engine or not properly secured in accordance with General Rule 5.23 may be kept standing on a connected line which is not isolated from
the through line.

(5) All Passengers running Lines shall be isolated from all Goods lines or Sidings connected thereto.
(6) All goods running Lines may be isolated from all sidings connected there to.
(7) It is not necessary to isolate one goods receiving line from another.
Refer to Annexure: 7-A1 for full extract of “Rules for Opening of Railway Lines – Rule 36” along with Diagrams on methods of providing isolation.

2 General
(i) The provisions of the above Table shall apply to future Signalling and Interlocking Installations. Wherever existing installations do not fulfill
these requirements, existing speed of operation may be permitted to continue.
(ii) In case Block working is achieved directly through Electronic Interlocking, provision of separate block instrument is not required.
(iii) This Table does not cover Semaphore Signalling (LQ,MAUQ, MLQ), 2 Aspect Colour Light Signalling, Mechanical Signalling/FPL, Key
Locking/Rudimentary Interlocking etc, where existing equipment & mode of operations may continue till their replacement.
(iv) Those existing Installations/Plans showing STD I (R), STD II (R), STD III (R), STD IV (R) (as per Previous SEM Part 1, 1988 edition) may continue
to show them till their replacement.
(v) Wherever Thick web Switches are provided, Direct Clamp Type Point Machines shall be provided.
(vi) ‘Attention’ aspect on Home signal shall be provided for run through with speed more than 30 kmph on Loop Lines.
(vii) In automatic territory where emergency braking distance is more than 1.0 km is to be catered for, 4 aspect automatic signalling shall be
provided. If not provided, suitable speed restriction shall be imposed.

Chapter 7: Essentials of Signalling Page 156 of 535