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railML 2.3 infrastructure extension proposal route information at signal [message #1520] Thu, 02 March 2017 16:20
Torben Brand is currently offline  Torben Brand
Messages: 23
Registered: March 2016
Junior Member
Dear railML infrastructure forum,
This posting contains the discussion to an extension towards the Signal
For use case and naming conformity I refer to the topic "railML 2.3 infrastructure extension for capacity planning and network statement usecases".
We need a simple route description for capacity modeling purposes. I see this as not yet interlocking, but a simple list of route attributes.
The extended route attributes are placed in the <NO:route> element under the signal that forms its starting position. There can be multiple <NO:route> elements under one <signal> element. There is one route element per route starting from the signal.
The new extended attributes are:

route topology

This to place the individual routes in the topology. One signal can have multiple routes starting from routeEntry, passing routeVia (or switchAndPosition) and ending at routeExit. One specific route can only start from one signal, and is placed under that signal in the railML structure.

@name [datatype: string] for example "A-1-L"
@routeEntry [datatype: ref to the <signal> starting the route]
@routeExit, [all datatype: ref to any element ending the route usually a signal]
@routeVia ( [datatype: ref to any element that the route passes and uniquely describes the route from other routes starting from and ending at the same signal.]
alternatively use @switchAndPosition. SwitchandPosition is used in the future interlocking schema to define route via topology. As this is somewhat complex and requires more data (all switch id's and their course along the route) we suggest using a simpler approach to just define any via element to distinguish the routes from each other.
@setTime [datatype: time in seconds]
Time for the route to be set by the CTC and interlocking. This is from the command is given by the dispatcher at the CTC/OCS terminal and to the signal light lights up or the movement authority is displayed in the MMI in the CAB.

Speed profile(s) for the route

@proceedSpeed [datatype: integer in km/h]
Proceed speed is a speed restrictions by the route. This is valid for the whole route (from signal to signal). No value=track speed
@releaseSpeed [datatype: integer in km/h]
Release speed is the speed at which the brake curve intervention is removed and the train driver is unsupervised except from SPAD. This is valid for the whole route (from signal to signal).
@approachSpeed [datatype: integer in km/h] used together with @approachPoint
@approachPoint [ref to any object from where the speed must be lower than the appraochSpeed this is usually a signal]
Used for a speed restriction on an approach zone in front of the route (Before RouteEntry) a train must obey if the route is closed (red light). The approachPoint refers to where the approach zone starts in front of the route. This is in Norway the distant signal in front of the route. The message is relayed to the train by a balise of type "fremskutt forsignal (FF)". The connection does not need to be modeled.
ApproachSpeed can also be used for multiple route approach speed profiling. This is outside our use case as it is not implemented in Norway.

Overlap in connection with the route

overlap conditions by the route. The overlap condition needs to be placed on the route and not on the ending signal as the overlap condition can vary per what route is set.
@overlapRef. The overlap always starts at the RouteExit signal. The reference is to the end of the overlap/slip. This is usually a train detection element.
@overlapValidityTime [datatype: time in seconds]. Duration the overlap is active blocking potential overlapping routes from forming. The overlap is formed together with the route and is released after overlapValidityTime has run out after the overlapReleaseTimer value has been triggered.
@speedInOverlap [in km/h; if the attribute is not set the default value is 0 km/h]. Not in our use case as speed in overlap is always 0 in Norway. This is a whish by Bob Jansen.

The overlap release condition (overlapReleaseTimer) can be generic determined by the @system defined in the <controller>. To distinguish between a slip and an overlap, is achieved with overlapValidityTime. If the value is set it's an overlap. If the value is not set the overlap is a slip.
The type of system will be mapped against attributes @overlapReleaseTimer and @overlapReleaseTimerHead. These will then not be needed in our use case. But I will include them here for completeness:

@overlapReleaseTimer [datatype:ref]
Reference to the trigger point for the overlap release timer. This is usually a train detection element.
If no overlapReleaseTimer is set, but a overlapValidityTime is set, the default value is that the timing starts from when the train has stopped on the route.
@overlapReleaseTimerHead [bolean]
"yes"= valid for first axel (head) of the train
"no"=valid for last axel (tail/rear) of the train

Use cases - The overlapValidityTime is triggered in different ways:
"occupyRoute"
@overlapReleaseTimer=ref to routeEntry signal with @overlapReleaseTimerHead=yes
For when the first axle of the train occupies the first TVD section of the route. For when the head of the train is at the routeEntry signal. Applicable for the following systems in Norway: SIMIS.
"releasePreviousRoute"
@overlapReleaseTimer=ref to routeEntry signal with @overlapReleaseTimerHead=no
For when the first axle of the train occupies the first TVD section of the route and the last axle releases the TVD section in front of the route. For when the rear of the train is at the routeEntry signal. Applicable for the following systems in Norway:NSI-63.
"stopOnRoute"
@overlapReleaseTimer and @overlapReleaseTimerHead not set.
For when the train has stopped on the route under ETCS L2 or on a station with a local dispatcher (that can verify that the train has stopped).
"slip"
@overlapReleaseTimer=ref to train detector element behind routeExit signal with @overlapReleaseTimerHead=no
for when the last axle releases the TVD section of the slip/overlap behind the route (DE:"Durchrutschweg").
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