Home » railML newsgroups » railML.infrastructure » [railML3] switch reference point (the switch tangent length can be used to calculate alternative switch reference points)
[railML3] switch reference point [message #2917] Mon, 21 February 2022 13:56 Go to next message
christian.rahmig is currently offline  christian.rahmig
Messages: 439
Registered: January 2016
Senior Member
Dear railML community,

in the last ETCS use case working group meeting on February 18, 2022 [1], we discussed about the switch data model in railML 3. One aspect that is also described in the slides [2] focuses on the switch reference point. Two switch reference points have been identified:
* the switch begin (begin of branching track)
* the switch center (usually taken as reference point in schematic visualizations)

In order to calculate one switch reference point from the other one, it is necessary to know the switch tangent length, which is the distance from switch begin to switch center and half the distance between switch begin and switch end. Therefore, a new optional attribute <switchIS>@tangentLength (tLengthM) has been proposed [3].

Since the crossing is a functional infrastructure element quite similar to the switch, I wonder if we should model the "switch tangent length" also for the crossing? Is there anyone, who needs an attribute <crossing>@tangentLength? Any comments are highly appreciated...

[1] https:// www.railml.org/en/event-reader/railml-is-etcs-telco-2022-02- 18.html
[2] https://cloud.railml.org/f/82180
[3] https://development.railml.org/railml/version3/-/issues/493

Best regards
Christian


Christian Rahmig – Infrastructure scheme coordinator
railML.org (Registry of Associations: VR 5750)
Altplauen 19h; 01187 Dresden; Germany www.railML.org
Re: [railML3] switch reference point [message #3059 is a reply to message #2917] Tue, 14 March 2023 20:47 Go to previous message
christian.rahmig is currently offline  christian.rahmig
Messages: 439
Registered: January 2016
Senior Member
Dear railML community,

since there has been no feedback requesting an attribute <crossing>@tangentLength, I conclude that this parameter is not needed for your data exchange use cases. However, the switch tangent length has been implemented with railML version 3.2 as described in the git issue #493 [3].

[3] https://development.railml.org/railml/version3/-/issues/493

Best regards
Christian


Christian Rahmig – Infrastructure scheme coordinator
railML.org (Registry of Associations: VR 5750)
Altplauen 19h; 01187 Dresden; Germany www.railML.org
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