Page 584 - IRSEM_Main Book

S No Term Description/Meaning in SEM Relevant paras
Limit of the ratio of the conditional probability that the instant of time T, of a failure of a 3.1,3.5 of Annexure: G1
59 Failure Rate product falls within a given time interval (t, t+ Δt) and the duration of this interval Δt, when
Δt tends towards zero, given that the items is in an up state
Factory A type of Testing done to check whether Software logics of Interlocking/Equipment, to be 3.6.5(b), 21.5.2(a)
60 Acceptance Installed are responding fully in accordance with logics defined in Control Tables. This is done (b)(d), 13.1.9(c),
Test (FAT) without any Interface wiring in Relay Room and no connection to Outdoor equipments.
Means a signal of fixed location indicating a condition affecting the movement of a train and 12.5.10(a), 13.2.2 (b),
61 Fixed Signal
includes a semaphore arm or disc or fixed light for use by day and fixed light for use by night. 20.1.2(b), 20.1.3(a)
7.1.14(d), 7.3.6(b),
It marks at which the infringement of two fixed Standard Dimensions fouling block occurs, 7.4.9(b), 7.6.5(b),
62 Fouling Mark where two lines cross or join one another. It is placed at a location, where centre to centre
7.6.6(c), 12.5.6,
distance is less than 4265 mm for existing works and 5300 mm for new works.
17.2.4(a)(b)
Functional Part of overall safety that depends on functional and physical units operating correctively in Annexure: G1(S.No-4.1)
63
Safety response to their inputs.
Means a train (other than material train) intended solely or mainly for the carriage of animals Annexure: 13-A1
64 Goods Train
or goods.
7.1.14(c), 7.5.3, 7.5.6,
Means the railway servant in charge of a train and includes a Brakesman or any other railway
65 Guard 7.7.2(f), 8.1.9(e),
servant who may for the time being be performing the duties of a Guard.
22.1.1(c)
66 Hazard Condition that could lead to an accident. 17.4.2(h), 17.5.4 (e)
Hazard Process of identifying hazards and analysing their causes and the derivation of requirements
67
Analysis to limit the likelihood and consequences of hazards to a tolerable level.
Annexure: G1
68 Hazard Rate Rate of occurrence of hazard.
(3.4, 4.12)
It is an arrangement for the changeover of system from one active unit to another active unit, 13.3.3(b)(d), 21.4.6(a)
69 Hot Standby
being provided for same purpose.
19.2.1(b),
70 Implantation Horizontal distance from centre of the track.
Annexure: 3-A1

Annexure: G4: Glossary of Technical Terms for Signal Engineering Manual Page 520 of 535