| How to interpret application direction for derailers [message #3542] |
Mon, 07 April 2025 10:52  |
Torben Brand
Messages: 180
Registered: March 2016
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Senior Member |
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There are two issues here. How to interpret application direction for derailers and if using "both" how to interpret the derailing side.
In Norway we only have derailers valid in either normal or reverse application direction. Ref top image on railML wiki page for derailer [1]. The shown derailer (picture is taken from the back of the derailer) has the intended derail application direction (in the image) from left to right). Some have argued that a wagon hitting the derailer from right to left would also derail. But as this is not the intended application direction, I would suggest to make the documentation more clear (for none derailer experts... 😉) in this matter.
Example for a derailer with application direction "both" would be as shown in top image titled "Hinged derail with automatic blue flag» in Wikipedia page [2]
For derailers with application direction "both" there is no defined @derailSide with the current definition of the documentation [1]:
@derailSide: the side to which the railway vehicle will be derailed in reference to the application direction of the derailer: possible values are left and right (optional; xs:string)
Possible values:
• left: the railway vehicle will be derailed to the left side in reference to the application direction of the derailer
• right: the railway vehicle will be derailed to the left side in reference to the application direction of the derailer
I suggest adding to the documentation in the next service release:
If @applicationDirection is set to "both" then @derailside follows the direction of the referenced net element(s).
[1] https://wiki3.railml.org/wiki/IS:derailerIS#3.3-0
[2] https://en.wikipedia.org/wiki/Derail
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| Re: How to interpret application direction for derailers [message #3563 is a reply to message #3542] |
Mon, 14 April 2025 12:07  |
christian.rahmig
Messages: 505
Registered: January 2016
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Senior Member |
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Dear Torben,
thank you for bringing up this question.
Yes, you are right: the derailer's application direction describes the direction of travel, for which the derail functionality is intended.
The example with the bi-directional derailer is interesting. I think, we should add it on the wiki page about derailers.
What to do with the @derailSide in case of @applicationDirection="both". Your proposal is perfect, I would have defined it the same way. Documentation on wiki page will be adapted...
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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