Understanding sequence of Understanding sequence of operationsoperations&&conditions for clearing signalconditions for clearing signal

Presented by-Presented by- Shiv MohanShiv Mohan

ATC & Systems ManagerATC & Systems Manager

Route sett ing request by VDU, ATS Or CCIP

Preliminary Condit ions Check By ATS

Condit ions Check By interlocking

If condit ions fulf i l led?NO

YesRoute Control

Call ing Points by Route, points Set & locked

Route Locking

Point detection check

Check authorization for manual point control

Light ing Of Signal aspect & route Indicator

declined

Aspect control

Route ControlRoute Control• A ”route control” can only set a route ,when all the A ”route control” can only set a route ,when all the

following applicable conditions are met: following applicable conditions are met: • (a) all conflicting routes and conflicting train turnaround (a) all conflicting routes and conflicting train turnaround

cycles are proved normal & the associated signals are cycles are proved normal & the associated signals are free of approach lockingfree of approach locking

• (b) the route locking sections must not be locked in the (b) the route locking sections must not be locked in the opposite direction of the considered routeopposite direction of the considered route

• ( c) all points required for the route , flank protection and ( c) all points required for the route , flank protection and trapping protection are SET in the correct position or are trapping protection are SET in the correct position or are free to be moved to the correct positionfree to be moved to the correct position

• (d) the opposite overlap, downstream signals which are (d) the opposite overlap, downstream signals which are origin of opposite route, if they are in the same section of origin of opposite route, if they are in the same section of tracktrack

Cont……..Cont……..• (e) no conflicting cycle to the considered route is set.(e) no conflicting cycle to the considered route is set.• (f) the route is not blocked.(f) the route is not blocked.• (g) the maintenance block for this route is not set. (g) the maintenance block for this route is not set.

Fleet route controlFleet route control• These routes are on the main line and permit to maintain These routes are on the main line and permit to maintain

the carrousel.the carrousel.• An “fleet control” can only set a route when all the An “fleet control” can only set a route when all the

following applicable conditions are met.following applicable conditions are met.• (a) all conflicting routes and conflicting train turnaround (a) all conflicting routes and conflicting train turnaround

cycles are proved normal & the associated signals are cycles are proved normal & the associated signals are free of approach lockingfree of approach locking

• (b) the route locking sections must not be locked in the (b) the route locking sections must not be locked in the opposite direction of the considered routeopposite direction of the considered route

• ( c) all points required for the route , flank protection and ( c) all points required for the route , flank protection and trapping protection are SET in the correct position or are trapping protection are SET in the correct position or are free to be moved to the correct positionfree to be moved to the correct position

Cont……..Cont……..• (d) the opposite overlap, downstream signals which are (d) the opposite overlap, downstream signals which are

origin of opposite route, if they are in the same section of origin of opposite route, if they are in the same section of tracktrack

• (e) no conflicting cycle to the considered route is set.(e) no conflicting cycle to the considered route is set.

**The route does not release after passage of train.The route does not release after passage of train. **This control permits also to change a route which has This control permits also to change a route which has

been set in non-fleet mode to an fleet modebeen set in non-fleet mode to an fleet mode

Calling Points by RouteCalling Points by Route• If the route setting conditions are fulfilled, the following If the route setting conditions are fulfilled, the following

controls are realized:controls are realized:• all points required for the route, flank protection and all points required for the route, flank protection and

trapping protection are SET in the correct positiontrapping protection are SET in the correct position• Where necessary, all points of the overlap are SET in Where necessary, all points of the overlap are SET in

the correct position.the correct position.• Each point of a route is locked by the subroute or the Each point of a route is locked by the subroute or the

suboverlap associated to the track circuit of the suboverlap associated to the track circuit of the considered point and by track itself. This is called point considered point and by track itself. This is called point locking.locking.

• this will not be released until the route is cancelled and this will not be released until the route is cancelled and the associated signal is ON and free of approach the associated signal is ON and free of approach locking.locking.

Route lockingRoute locking• The route is set.The route is set.• All the subroutes of the considered route are locked. this All the subroutes of the considered route are locked. this

will permit:will permit:• to lock all the points in the route to prevent them from to lock all the points in the route to prevent them from

moving while a train passing between the protecting moving while a train passing between the protecting signal & the track circuit which directly lock the points. signal & the track circuit which directly lock the points. (dead locking)(dead locking)

• To lock all trap and flank points to prevent them moving To lock all trap and flank points to prevent them moving until the train has passed beyond the place where the until the train has passed beyond the place where the trapping and/or flank protection is required.trapping and/or flank protection is required.

• All the suboverlaps are locked.All the suboverlaps are locked.

Point detectionPoint detection• After calling of points, points will move in the called After calling of points, points will move in the called

direction only if they are free to move.direction only if they are free to move.

The new detection of the points is realized when:The new detection of the points is realized when:

• One blade is proved open.One blade is proved open.• The other blade is proved closed.The other blade is proved closed.• The point machine is proved in correct position.The point machine is proved in correct position.

Emergency manual points controlEmergency manual points control• When the electrical control is defective, the points are manually When the electrical control is defective, the points are manually

controlled by means of lever on site.controlled by means of lever on site.• This is possible by the removal of a key from its electric lock on EKT This is possible by the removal of a key from its electric lock on EKT

box in the SCR.box in the SCR.• The removal of this key is only possible with the authorization given The removal of this key is only possible with the authorization given

by the VDU.by the VDU.• The authorization is given if no other routes accessing to these The authorization is given if no other routes accessing to these

points is locked in approachpoints is locked in approach• The authorization for manual point control results in the following:The authorization for manual point control results in the following:• Confirmation that the route signals are ON.Confirmation that the route signals are ON.• Cutting off the electric control of the point.Cutting off the electric control of the point.

• Cancellation of the authorization for manual control is Cancellation of the authorization for manual control is made only if the key is locked in EKT boxmade only if the key is locked in EKT box

Aspect Control Aspect Control • The signal will be permitted to display a proceed aspect The signal will be permitted to display a proceed aspect

(violet or green) if following condition are satisfied:(violet or green) if following condition are satisfied:• The route must be set & route locking is effected.The route must be set & route locking is effected.• The traffic direction of the route is set.The traffic direction of the route is set.• The opposite traffic direction associated to the signal The opposite traffic direction associated to the signal

berth track circuit is not set.berth track circuit is not set.• All the points of the route must be set. Locked and All the points of the route must be set. Locked and

detected in the position controlled by the route.detected in the position controlled by the route.• All the points in the protection must be set, locked and All the points in the protection must be set, locked and

detected in the protection position (flank and trap detected in the protection position (flank and trap protection).protection).

• The authorization of point manual control is not given.The authorization of point manual control is not given.• All the signals are unblocking. All the signals are unblocking.

At lastAt lastLighting of the signal AspectLighting of the signal Aspect&&

Lighting Of the Route indicatorLighting Of the Route indicator

Establishing of RouteEstablishing of Route• Route in the same CBIRoute in the same CBI• Route Setting Route Setting • After a control of route the route will be set if all After a control of route the route will be set if all

following conflicted conditions are not set.following conflicted conditions are not set. Route Locking Set under control not set Route Locking Set under control not set Destruction of route under control not activated Destruction of route under control not activated Conflicted route not set Conflicted route not set Conflicted Sub route released Conflicted Sub route released Maintenance Block associated at the route under control Maintenance Block associated at the route under control

not block not block Routes under control not blockRoutes under control not block Conflicted overlap releasedConflicted overlap released Conflicted Fleet route not set Conflicted Fleet route not set

Points of the route set and the points included in the Points of the route set and the points included in the fouling point are free to move or set fouling point are free to move or set

– After the route is set , After the route is set , Process all the direction of travel Process all the direction of travel of the route.of the route. Block the routes which request the points in the other Block the routes which request the points in the other

position than the route under control position than the route under control Control the points in the position requested by the Control the points in the position requested by the

route and the fouling point .route and the fouling point . After the points are powered.After the points are powered.

– When the route is set and the points are in good position When the route is set and the points are in good position the second step for establish the route, Stick Control or the second step for establish the route, Stick Control or Route Replacement, is processed to setRoute Replacement, is processed to set

– stick Controlstick Control or Route Replacement or Route Replacement – After the route replacement is set , this variable locked After the route replacement is set , this variable locked

all the Sub route belonging to the route .all the Sub route belonging to the route .

• Route Locking Set Route Locking Set – After all the sub route are locked After all the sub route are locked

the third and last step for establish the route is the third and last step for establish the route is controlled controlled

the points of the routes are locked.the points of the routes are locked.

– The three step of establishing of the route :The three step of establishing of the route : Route Set Route Set Stick Control or Route Replacement Stick Control or Route Replacement Route Locking Set Route Locking Set

– have to be processed under three seconds after one have to be processed under three seconds after one control of the routecontrol of the route

• After the Route Locking is Set After the Route Locking is Set this variablethis variable process:process:

All the traffic direction are set All the traffic direction are set Confirmation of locking of all the Sub route belonging Confirmation of locking of all the Sub route belonging

to the route.to the route.

Route between two CBI “A&B”.Route between two CBI “A&B”.• Route Set Route Set • Stick Control or Route Replacement Stick Control or Route Replacement

– After the route is set in CBI “A” After the route is set in CBI “A” this variable is sent to the this variable is sent to the CBI”B” CBI”B”

– In the CBI”B” if the conflicted route to the route under control In the CBI”B” if the conflicted route to the route under control are not set, the CBI”B” send to the CBI “A” an acknowledge are not set, the CBI”B” send to the CBI “A” an acknowledge

– After all the points are controlledAfter all the points are controlled After the Stick Control is processedAfter the Stick Control is processed

• Route Locking Set Route Locking Set – The Route Locking Set has the same functionalThe Route Locking Set has the same functional as previously.as previously.

– The three step of establishing of the route :The three step of establishing of the route : Route Set Route Set Stick Control or Route Replacement Stick Control or Route Replacement Route Locking Set Route Locking Set

– have to be processed under ten seconds after one control of have to be processed under ten seconds after one control of the routethe route

Route releaseRoute release• An automatic route releasing by the passage of the train( An automatic route releasing by the passage of the train(

in preferred mode)in preferred mode)• A manual route releasing by the action of the controller A manual route releasing by the action of the controller

(in degraded mode: i.e. following an error of route control (in degraded mode: i.e. following an error of route control or following a failure which requires to change of route)or following a failure which requires to change of route)

Route releasing & Approach Route releasing & Approach locking locking

– By the train “Train Operation Route Released” By the train “Train Operation Route Released” (TORR)(TORR)• First Step “TORR_ A”First Step “TORR_ A”

– The train occupied the berth track circuit then if:The train occupied the berth track circuit then if: Route destruction not activated. Route destruction not activated. Route Locking Set. Route Locking Set. first track circuit clearfirst track circuit clear signal is proceed to green or signal is proceed to green or

blue aspect .blue aspect . Approach Locking Section is not clearApproach Locking Section is not clear Approach Locking is lockedApproach Locking is locked

– The first step of route releasing is proceed The first step of route releasing is proceed

• Second Step “TORR_B”Second Step “TORR_B”– When the train pass the signal and occupied the first When the train pass the signal and occupied the first

Track Circuit then if :Track Circuit then if : Route Replacement de-activated Route Replacement de-activated Route setRoute set isis de-activatedde-activated Signal proceed aspect is turn on at red aspectSignal proceed aspect is turn on at red aspect. . Route Locking Set Route Locking Set TORR”A” activatedTORR”A” activated second track circuit clearsecond track circuit clear Approach section occupiedApproach section occupied

– The second step of route releasing is proceedThe second step of route releasing is proceed – TheThe first step of releasing of the Approach Locking is first step of releasing of the Approach Locking is

proceedproceed

• Third Step “TORR”Third Step “TORR”– When the train clear the berth track circuit ,When the train clear the berth track circuit , the Approach the Approach

section is clearsection is clear and when the train occupied the second and when the train occupied the second Track Circuit there is no change. Track Circuit there is no change.

– When the train clear the first track circuit then if :When the train clear the first track circuit then if : TORR”A” activatedTORR”A” activated Approach Locking ReleasedApproach Locking Released Approach Locking Section clearApproach Locking Section clear

– The third step of route releasing is processThe third step of route releasing is process – The Approach locking is releasedThe Approach locking is released

• After the Route Locking Set is released with the After the Route Locking Set is released with the following variablesfollowing variables

Route Replacement de-activated Route Replacement de-activated TORR activatedTORR activated Control of Route Locking Released is controlControl of Route Locking Released is control Route Locking Set is released Route Locking Set is released Route Locking Released is set Route Locking Released is set

– At this state the route is released and At this state the route is released and the Approach is released.the Approach is released.

Manual route releasingManual route releasing– By action of the operator, route destructionBy action of the operator, route destruction..

• When the operator control a destruction of the route, there When the operator control a destruction of the route, there are two casesare two cases::

– 1-Approach Section clear and signal 1-Approach Section clear and signal proceedproceed..

Route destruction controlRoute destruction control Route destructionRoute destruction if all the points position of theif all the points position of the route are route are

processed processed Route SetRoute Set Route Replacement Route Replacement Signal proceed aspect turn offSignal proceed aspect turn off Signal is process to red aspectSignal is process to red aspect Approach Section clearApproach Section clear Approach Locking clear Approach Locking clear Route Locking Released Route Locking Released

Control of Route Locking Released is controlControl of Route Locking Released is control Route Locking Set is released Route Locking Set is released Route Locking Released is set Route Locking Released is set

–At this state the route is released At this state the route is released and the Approach Locking is and the Approach Locking is released.released.

2- Approach Section Occupied and 2- Approach Section Occupied and signal proceed aspect:signal proceed aspect:

the following variables are processed:the following variables are processed: Route destruction controlRoute destruction control . . Route destructionRoute destruction if all the points position of theif all the points position of the

route are processed route are processed . . Route SetRoute Set Route Replacement Route Replacement Signal proceed aspect turn offSignal proceed aspect turn off Signal is process to red aspectSignal is process to red aspect Approach Section occupiedApproach Section occupied Approach Locking occupiedApproach Locking occupied Route Locking Released Timer startRoute Locking Released Timer start

– After 90 secondsAfter 90 seconds Route Locking Released Timer finish Route Locking Released Timer finish Approach LockingApproach Locking clearclear Route Locking Released Route Locking Released Control of Route Locking Released is controlControl of Route Locking Released is control Route Locking Set is released Route Locking Set is released Route Locking Released is set Route Locking Released is set

–At this state the route is At this state the route is released and the Approach released and the Approach Locking is released.Locking is released.

Fleet RouteFleet Route• Establish a Fleet routeEstablish a Fleet route

• Fleet Route Setting Fleet Route Setting – After a control of fleet route the fleet route will be set if After a control of fleet route the fleet route will be set if

all the same conflicted conditions as to set the same all the same conflicted conditions as to set the same route in non fleet route are not set.route in non fleet route are not set.

– After setting a fleet route the others step to establish the After setting a fleet route the others step to establish the route are the same as to establish the same routeroute are the same as to establish the same route

– Route Releasing & Approach Locking in Fleet Route Releasing & Approach Locking in Fleet Route.Route.• By the trainBy the train

– Train occupied the berth track circuit.Train occupied the berth track circuit. The first step (TORR_A) is inhibit by the variable The first step (TORR_A) is inhibit by the variable

– Train Occupied the first track circuit, of the route.Train Occupied the first track circuit, of the route. Route Replacement and Route set are not Route Replacement and Route set are not

de_activated de_activated Signal proceed aspect is turn on at red aspect by Signal proceed aspect is turn on at red aspect by

occupation of the Track Circuit.occupation of the Track Circuit.

– Transformation of Fleet Route of normal Transformation of Fleet Route of normal Route and vice versa.Route and vice versa.• It is possible to transform the fleet route in normal It is possible to transform the fleet route in normal

route with a control of destruction the fleet routeroute with a control of destruction the fleet route• It is possible to transform the normal route in fleet It is possible to transform the normal route in fleet

route with a control of the fleet route.route with a control of the fleet route.

overlapoverlap– Strike In sectionStrike In section

• When the route is set to the signal which includes When the route is set to the signal which includes an Overlap and when the train occupy one track an Overlap and when the train occupy one track circuit of the strike-in-section,circuit of the strike-in-section, the overlaps are the overlaps are locked. locked.

– Released of OverlapReleased of Overlap• When the train occupied last track circuit before When the train occupied last track circuit before

the Overlap, the Overlaps will be released after a the Overlap, the Overlaps will be released after a time “35s for Overlap ATC & 55s” for Overlap time “35s for Overlap ATC & 55s” for Overlap Signalling. Signalling.

– Two trains in Strike in section.Two trains in Strike in section.• Overlap locked by the first train.Overlap locked by the first train.

– When the Overlap is already locked by a first train if a When the Overlap is already locked by a first train if a second train enters in the Strike In Section, the Overlap second train enters in the Strike In Section, the Overlap will be released in the same manner than previously.will be released in the same manner than previously.

• Overlap released by the first train.Overlap released by the first train.– When the Overlap is already released by a first train if a When the Overlap is already released by a first train if a

second train enters the Strike In Section, the Overlap will second train enters the Strike In Section, the Overlap will be locked by the second only when the first train will be locked by the second only when the first train will leave the track circuit before the Overlap.leave the track circuit before the Overlap.

Thank youThank you