Classification
of stations
For the purpose of general rules Stations are classified as Block
stations and Non-Block stations, Block stations are those where an LP has to
obtain authority to proceed to enter the block section with his train.
Under Absolute Block system Block stations are further classified in to-
1.
‘A’
class
2.
‘B’
class
3.
‘C’
class
4.
Special
class
‘A’
class stations:
Ø Normally situated on
steep gradients, where vehicles are liable to escape by gravitational pull.
Ø In these stations,
more safety measures are necessary.
Ø Normally trains are
not permitted to stop at FSS.
Ø Condition for
granting LC at these stations is that the line must be clear for at least 400
mts beyond the Home signal or up to starter.
Ø Only Two Aspect
Signaling is provided at these stations so that the Home signal (FSS) is close
to the station.
‘B’
class stations:
Ø Stations are
situated normally on level gradients.
Ø Trains are permitted
to stop at FSS.
Ø Line Clear may be
granted for a train even when reception lines are obstructed.
Ø
Free
zone called as station section is provided where obstruction may be permitted
before/after granting line clear.
‘C’
class stations:
Ø These stations are
only for operational conveniences and not for traffic purposes and trains are
not booked to stop.
Ø To improve the line
capacity by splitting a lengthy block section into two.
Ø Condition for
granting LC is that the previous train has passed atleast 400 mts beyond Home
signal completely and continuing its journey.
Ø There are no points
and no station section.
Ø An Intermediate
Block Post on a Double line is also treated as `C` class station. It may be an
IBP or IBH.
Ø IBH may be provided
both in single line and double line and IBP only on double line.
‘D’ class stations:
Ø These are the
stations where commercial transactions take place and do not form boundary of
any block section.
Ø The Station warning
boards are provided at NLT 1200M in rear of such stations.
Ø Also called as Halt
or Non-Block stations or flag stations.
Special class stations:
Ø Stations which
cannot be worked under the rules of A, B, C & D class are special class
station.
Ø The SWR of special
class stations where passenger trains run shall be approved by CRS.
Ø Stations in
Automatic Block system and some stations in Absolute Block system are special
class stations.
