what is control table/ Route control chart /table of control /Selection table

4)Explain Route control chart /table of control /Selection table with each column?

ANS)As it will be cumbersome to prepare the signaling circuits directly from the signal interlocking plan (SIP). The various safety aspects such as interlocking of conflicting routes, requirements of points for each route, the track circuit controls for the points, the route holding requirements such as approach locking and back or route locking and other controls such as crank handle controls, gate controls, block control and overlap release, etc. are first put in a table called “control table.” Or “selection table” and this table is used in the preparation of circuits.

It specifies the routes on which the train can be travel without any collisions/derailments . An interlocking system implements this control table making sure that the running of trains in safe.  Control table for interlocking system in Indian Railways is done by a private companies like Siemens, kyosan,hitachi,medha servo etc.

In this control table,

Column 1: S.no

serial no for the routes

column 2: Signal No

Each signal is denoted by a specific standard number for that same name or number will not allocate for any two signals in a same station

Ex:S1,S3,S50

Column 3: Signal Route

This column is about the route in a station yard (from a signal to loop line for reception of  train or  starter signal to adv str signal for dispatching of train)

For example : S1-A,S1-A1,S1-B etc.

Column 4: Buttons Operated

In this column , we write the about the Signal & Route buttons which are used to give a route..  signal button –GN, route button-UN

For example:  S50-A, in this S50 is a signal button(GN) and  A Route button(UN).

Column 5: Overlap no

Every  main signal route has overlap no , to provide this overlaps for particular routes we are using some overlap no based on the number of that a head sig.

For example we are given a route from S1-A in that the route starting from the foot of the S1 signal and End at loop line starter signal S5 ,this S5 starter has two overlaps because it’s a loop line that overlap no is OV1-5, OV2-5

Column 6: Point(Route,Isolation,Overlap)

POINTS
ROUTE		ISOLATION		OVERLAP
Normal	Reverse	Normal	Reverse	Normal	Reverse
51	52	-	-	`54

This column about the points requirement and position in normal and reverse in overlap, isolation, route.

In the above table we can see the position of the points for one route including isolation and overlap.

Column7: TRACK CIRCUITS (Approach locking, back locking, controlling tracks)

In this column three sub columns are there 1.approach locking, 2.back locking, 3.controlling track.

In the above lockings column we are providing the tracks which are under control of particular locking because of that reason we are mentioning this .by this we ensure the several interlocking methods while making circuits.

APPROACH LOCKING	BACK LOCKING	CONTROLLING TRACK CKTS
		ROUTE	OVERLAP
DA	1T,44/48T,51BT 51AT.	1T,44/48T,51BT 51AT,1LAT,1LBT.	53AT

In the above table we are seeing that controlling track circuits in that we are writing the route-in this column we are showing the tracks which are in that particular route from the foot of the reception signal to the a head signal tracks.Overlap- in this we are showing the tracking which is after at the head signal(starter sig).

Column8: CRANK HANDLE CONTROL(CH)

In this column we are putting the crank handles of the points which are used for the specified route

CH CONTROL

CH1,CH2,CH4

For example :point no 51 its crank handle is CH1

 

Column9: LC GATE CONTROL

IN this we are mentioning the particular gates which are in routes are in for the certained position

For example we are giving a route from s1 to the a  in that route if there is any gate that should be in required position for the movement of train.(LX101).

 

Column10: ASPECT OF THE AHEAD SIGNAL

In this column we are mention the a head signal which should be in required position as per the route.

Column11: Other controls

In this we mention  If Route for,

home signal-route indication lit/not should be mention

callingon –C1T Track  must be occupied

advance starter- Line clear from stn ahead

Coloumn12: ROUTES TO BE LOCKED

In this we mention the all other routes which are conflicting for our selected route.

For example we are given route for S1-A for that reason for this conflicting is

SAME DIRECTION	DIRECT OPPOSITE	INDIRECT OPPOSITE
C1-A,SH19-A	S42-H,S44-G	SH20-B,C50-B

The above routes are should be locked for proceeding our selected route.

Column13:REMARKS

In this we mention the route cancellation for home-120sec, for calling on route cancellation-240sec, for calling on route clearance for -120sec