Page 576 - IRSEM_Main Book

S No Term Description/Meaning in SEM Relevant paras
Automatic Train Supervision (ATS) which comprises of various sub-systems which are used to Annexure: G2
Automatic
regulate and control the operations of all the trains in the network by monitoring the
Train
18 positions of trains all over the network at every instant and implementing the pre defined
Supervision operator commands for automatic route setting at interlocking and automatic turn backs at
(ATS)
the terminal station etc.
Ability of an item to be in a state to perform a required function under given conditions at a Annexure: G1
19 Availability given instant of time or over a given time interval, assuming that the required external
sources are provided.
An electrical device which, when provided at two given points on the track, proves by 7.6.4, 7.8.2(c), 8.7.17,
20 Axle Counter counting axles in and out, whether the section of the track between the said two points is 17.3.13, 17.6.1, 17.7.4,
clear or occupied; 17.8.1, 18.10.1, 21.1.17
The track device comprising of the coils sealed in a cover mounted on the rail. It will detect 17.6.1, 17.7.2(b) (c)(d)
21 Axle Detector
the wheel of rolling stock axle passing over the device.
It is a locking provided on all points in the route of a train (which has passed the signal), in 7.6.2, 7.6.3, 14.1.7(e),
Back Locking/ order to prevent their unlocking, till clearance of the last point zone track circuit by the said 14.1.9(b), 19.8.11(g),
22
Route Locking train. It also provided on LC gates (where required) for preventing such unlocking of LC Gate 14.3.2(k), 20.2.2(i),
till the said Train has passed beyond LC gate. 21.1.3(d), 21.1.11(c)
13.2.1(b), 13.2.2(d),
Balises mounted between rails transmitting the information electro magnetically through low
23 Balise 13.2,3 (b,c,e,g), 13.2.4
frequency modulations to be picked up by antenna mounted below the engine of the trains.
(c,d,e,f), 13.2.5(a,b,c)
7.1.19(a),7.6.2(b),14.2.
That portion of Track which a train occupies, when concerned stop signal is displaying a ‘stop’
24 Berthing Track 1(a),17.2.6(a),19.8.9(e),
aspect. The Track Circuit that is on the approach to a signal is called berthing track circuit.
21.1.6(i),21.1.8(b)
To dispatch a message from a block station intimating to the block station immediately in
25 Block Back rear on a double line or to the next block station on either side on a single line, that the block
section is obstructed or is to be obstructed
26 Block Forward To dispatch a message from a block station on a double line intimation to the block station
immediately in advance the fact that the block section in advance is obstructed or is to be
obstructed.

Annexure: G4: Glossary of Technical Terms for Signal Engineering Manual Page 516 of 535