Page 602 - IRSEM_Main Book

S No Term Description/Meaning in SEM Relevant paras
Is an analytical branch of engineering technology about ensuring high values of confidence,
System
155 reliability, availability, maintainability and safety of complex engineering systems.
Assurance
System Assurance = RAM Assurance + Safety Assurance.
System of Means the system adopted for the time being for the working of trains on any portion of a Annexure-18-A5(I)
156
Working railway.
157 Target Location where the train speed should be below the given target speed. 13.2.3(j)(i), 13.3.1(b)(ii),
Tolerable Annexure: G1(3.4, 4.12)
158 A hazard rate which guarantees that resulting risk does not exceed a target individual risk.
Hazard Rate
Track 13.1.4(b), 13.1.5(b),
159 Description Information containing static speed profile and gradient profile which complements the 13.1.9(e), 13.3.4(h),
Movement Authority.
Data
160 Track Side The equipment with the aim of exchanging information with the vehicle for safely supervising 13.1.4(b), 13.2.3(b),
Equipment train movement. The information exchanged between track and trains can be either 13.2.5(b), 13.3.2
continuous or intermittent according to the ATP level and to the nature of it.
Means an electrical circuit provided to detect the presence of a vehicle on a portion of track. 7.6.4, 7.8.2(c), 8.7.17,
Train
161 It`s purpose is to detect the presence or absence of train on a defined section. 19.8.7(a), 20.1.5,
Detection
(Note: DC track circuits, AFTC track circuits, Axle Counters are used for this purpose) 21.1.17
Means a railway servant duly qualified to examine trains and certify their fitness for safe
162 Train Examiner running and includes and their railway servant who may for the time being be performing the
duties of Train Examiner.
163 Train Integrity The level of belief in the train being complete and not having left coaches or wagons behind. 13.2.2(c), 13.3.4(c)
Train Interface The unit, inside the on-board equipment, that provides the interface between the on-board 13.2.3(b)(c), 13.3.3(f),
164
Unit equipment of ATP and the train.
Has Points leading to a short dead end and used solely for the purpose of trapping the 7.4.10(c)(d),
165 Trap Siding
running line or sidings. This shall also be treated as derailing switch.
An electric lock on a point mechanism and/or on its connections, effective when a train 12.28.2(c), 21.1.9(d),
166 Track Locking
occupies a given track circuit, to prevent movement of points under the wheel.

Annexure: G4: Glossary of Technical Terms for Signal Engineering Manual Page 529 of 535