Page 600 - IRSEM_Main Book

S No Term Description/Meaning in SEM Relevant paras
Single Section 21.1.1 (d), 21.1.17(d)
Digital Axial Annexure-18-A5,
144 Single Section Digital Axle Counter is generally used to monitor single track section.
Counter Annexure: 20-A1
(SSDAC)
Means ‘Signal Passing At Danger’. It is an alarming event, in which a speeding train 7.6.9, 13.3.1(a)
145 SPAD overshoots a Stop/Shunt signal displaying a ‘Stop’ aspect, and can cause a potential risk of
accident to itself and other trains.
Special 7.1.5(b), 7.1.8, 7.1.17,
146 Means instructions issued from time to time by the authorized officer on a case to case basis.
Instructions 20.4.1 (a)
Specially 21.3.1(c)(e)(g),
147 Lawful approval for a special Case exception.
Permitted 21.3.2(g)
The description of the fixed speed restrictions of a given line. The speed restrictions can be
Static Speed
148 related to items such as maximum line speed, gradients, curves, points, tunnel profiles,
Profile
bridges etc.
3.5.2(a), 3.8.1(d),
Means any place on a line of Railway at which traffic is dealt with, or at which an authority to
149 Station 7.1.10, 8.1.1, 12.25.8,
proceed is given under the system of working.
14.1.8
Means the portion of a railway, which is under the control of a Station Master and is situated 7.4.12, 14.1.7, 14.1.8,
150 Station Limits
between the outermost signals of the station or as may be specified by special instructions. Annexure 14-A1
151 Station Master Means the person on duty who is for the time being responsible for the working of the traffic 7.6.6(c), 12.25.8,
within station limits, and includes any person who is for the time being in independent 13.4.8(d), 19.9.7
charge of the working of any signals and responsible for the working of them.
Means that section of station limits, Where shunting is permitted even after granting Line 7.5.1, 15.2.3(k),
152 Station Section
clear. 17.6.2(c), 19.2.6
Means a special instruction, which is subservient to the General Rule to which it relates and 3.5.2(a), 3.8.6(a),
153 Subsidiary Rule
shall not be at variance with any General Rule. 9.1.1(a),

Sufficient A reasonable distance to be provided if there is no site constraints. It is more than “Required
154
Distance Distance”.

Annexure: G4: Glossary of Technical Terms for Signal Engineering Manual Page 528 of 535