Level crossing related signal types

Description

Current schema already allows description of level crossing related railway signals. This includes (c.p. Wiki):

• signals telling the train driver to ring the loco's bell or blow the loco's whistle
• signals announcing an upcoming level crossing
• signals that mark the position where the level crossing activating train detector is situated

What is missing is a type for the final level crossing supervision signal that is located immediately before the level crossing.

Background

See situation in Norway: [http://orv.jbv.no/orv/doku.php?id=tjn:kap_9:ll._lyssignaler#planovergangssignal_9-28]

Links

• Forum discussion
• Torben Brand, 24.02.2017: [https://www.railml.org/forum/index.php?t=msg&th=487&goto=1515&#msg_1515]
• Trac ticket
• Wiki documentation
• IS:levelCrossing signal: [https://wiki.railml.org/index.php?title=IS:levelCrossing_signal]

Proposed solution in railML 2.4

Add another level crossing signal type "supervision".

Resulting example:

<signal id="sig01">
  <levelCrossing type="supervision" ref="lcr01" switchable="true" />
</signal>

Further, level crossing signal types shall be better documented in Wiki.