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PREPARATION OF TABLE OF CONTROL
Signalling Routes
From the signalling plan, table of movement is prepared.
1.
LOCKS AND DETECTS POINTS
a. Point setting for each route is identified including
isolation and overlap.b. Conditional isolation for shunt/calling-on
moves is provided in major yards to
provide flexibility.
2. LOCKS NORMALa. Square sheet is prepared to define the
relation of each route with all other
routes. Routes locking each other by point setting are
identified first. The rest
of routes contain either directly conflicting or parallel moves.
They arescrutinized and the routes directly conflicting alone
listed in the control table.
b. Following guidelines are followed to decide the conflicting
moves:i. Routes sharing same track portion.ii. Calling on signal
below Home signal and starter/shunt below starter
ahead and vice-versa.iii. Home signal and shunt below starter
and vice versa.iv. Shunt moves reading to advanced starter and vice
versa.v. Ground shunt (back shunt) and advance starter and vice
versa.vi. Ground shunt (back shunt) and starter/calling on below
starters in
advance and vice versa.
vii. Likelihood of over-shooting shunt move colliding with a
main move inthe absence of any isolation (to comply with G.R.
5.16)
viii. Main moves, where stipulated 300m physical separation is
not availablein lieu of isolation (to comply with CCRS circular
no:35).
ix. Siding point controls and the moves require isolation of the
siding point.x.
Other moves that are deemed to be conflicting on scrutinizing of
theplan.
3. CONTROLLED BY TRACKSa. Track circuits that controlling the
signal is also listed from the Sig. plan.b. Information regarding
fouling track circuits, if any, obtained from field and
included in controlled by tracks column.
4. ROUTE HELD BYApproach Tracks.a. The approach locking of
signal releases immediately on putting back the signal
to ON if the approach track circuits are clear.
b. For shunt signal/loop line starter, the track circuit
immediately in rear of thesignal constitutes the approach
track.
c. For home signal the track portion between home and signal in
rear constitutesapproach track.
d. For main line starter the berthing track in rear as well as
route setting from anyhome signal towards the main line starter
form approach locking.
e. In case of signal not having any approach track circuit or
the approach track isoccupied, the approach locking of the signal
is released after a specified timedelay. This is called dead
approach locking.
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f. For the signals, whose replacement to ON will not cause any
change in theaspect of the signal in rear, approach checking time
will be 60 sec. Otherwise it
will be 120 sec.
Back lock tracks:
All the track portions of the route except the track on which
the train completes
its journey (berthing track), form the back lock tracks.
5. Remarks column1. Crank handle proving is derived from Sig.
plan.2. LC proving is included.3. Aspect requirement for higher
aspect like HHG/DG is mentioned4. Line clear condition is
mentioned.5. Siding control Key IN proving is indicated.6. Route
Indicator particular is included.7. Ahead Signal lit is shown for
Main Signals.
POINTS
1. In the point locking table, all the routes require the point
to be set in Reverseposition are listed under point normal column
and all the routes require the
point to be set in Normal position are listed under point
Reverse column2. Track circuits over the point zone listed below
controlled by tracks column.3. Concerned CHR group pertaining to
the point listed in remarks column.
Notes:
1. Aspect sequences of signals that are not directly controlled
yet dependent onthe station-controlled signals like Distant signal/
Inner Distant signal are listed.
2. CHR grouping particulars is given for ready reference.3. Any
deviation/relaxation from the route release conditions are
mentioned like
Calling-On Emergency Route release, Time delay in route release
for the single-
track section routes.4. Overlap holding is reiterated.5. LC gate
details are given.6. Details of Calling on signal working are
elaborated.7. Any other special signalling features.
