Page 587 - IRSEM_Main Book

S No Term Description/Meaning in SEM Relevant paras
In Advance of
71 A term used in defining a territory beyond a signal as seen from the approaching train.
A Signal
In Rear of A Means the territory over which an approaching train has to pass before reaching the signal 7.1.15(d)
72
Signal location.
Independent Process to determine whether the system/product meet the specified safety requirements
73 Safety and to form a judgment as to whether the system/product is fit for its intended purpose in
Assessment relation to safety.
The signalled route can be released only after concerned signal is put back to danger after 12.28.2(c), 14.2.1(p),
passage of train beyond the signal or route for signal has been cancelled in addition to other 21.1.9(d)
conditions. Such locking on points is known as Indication locking on signals.
Indication
74 (Note:- The signals are operated by control cum indication panel or VDU control terminal. The
Locking
point indication relay picks up only after the correspondence between point operation
command relay picked up in the relay room and point position at site is satisfied. This locking
is known as Indication locking on point).
1.3.7(b), 2.2.1(d),
Means an arrangement of signals, points and other appliances, operated from a panel or
2.3.1(b), 3.1.1, 3.1.5(b),
75 Interlocking lever frame, so interconnected by mechanical locking or electrical locking or both that their 3.2.1(c), 3.5.3(a), 3.5.7,
operation must take place in proper sequence to ensure safety.
3.6.3(c), 3.8.2(a)
Intermediate It is a class `C' station on a single line, double line or multiple line remotely controlled from 7.1.14(g)
76
Block Post the block station in rear.
Intermediate Means an arrangement of Signalling on single line, double line, in which a long block section 7.1.14(g), 8.1.1(b),
Block is split into two portions each constituting a separate block section of a block section by 13.4.2(a), 18.12.1,
77
Signalling (IBS) providing an Intermediate Block Post. 18.12.2(a), 18.12.3,
18.12.4, 18.12.5
Intermediate
78 Siding/ Siding line taking off from running line and located in the block section.
Outlying Siding
INDIAN RAILWAY 8.2.1
79 A set of Standards applicable to Railway specific Equipments/Technologies.
STANDARD (IRS)

Annexure: G4: Glossary of Technical Terms for Signal Engineering Manual Page 521 of 535