[openrailwaymap] Proposal for new Ks signal tagging scheme

[PeterDRS]

Proposal for new tagging scheme for Ks signals

A. Problem

Today there are 3 different signal "types" for tagging:
- distant
- main
- combined
signals.

The only participant in train protection are main and combined signals.

Distant signals do not manage the movement authority. They "just" announce the
state of the following main aspect signal.

Combined signals are no special "type" of signal, they just be "intelligent"
with showing the signal states.

That means, the aspects of signals can show the following:

- main: Hp0, Ks1
- distant: Ks1, Ks2

When combining two aspects, some states are suppressed:

Main + Distant = Shown state
Hp0 + Ks1 = Hp0
Hp0 + Ks2 = Hp0

Ks1 + Ks1 = Ks1
Ks1 + Ks2 = Ks2

B. Solution

It would be much more logical to map both aspects, main and distant, at one
node.

Advantages:
- When not knowing whether a signal is main or combined, it stays flexible to
change it later.
Nowadays, you have to delete all "combined" tags and make "main" tags an vice
versa
- No need to have 2 (main + combined) namespaces with all the properties of
signals
- No need to maintain 2 JOSM preset items
- Possibility to filter all main aspect signals, no matter whether they are
"combined" signals or "normal" main signals

To tag the states I propose to tag a main aspect signal:
railway:signal:main=DE-ESO:ks
That makes a signal identified as Ks signal, no matter of the states
railway:signal:main:states=DE-ESO:hp0
That is what every main aspect signal can show
Optional:
railway:signal:main:states=DE-ESO:hp0,DE-ESO:ks1

Every distant signal can show DE-ESO:ks2
There is no need to tag this.
If a distant signal can also show ks1, tag:
railway:signal:distant:states=DE-ESO:ks1,DE-ESO:ks2

There are signals before a buffer stop that can only show Hp0 and Ks2.

They would be tagged as follows:
railway:signal:main=DE-ESO:ks
railway:signal:main:states=DE-ESO:hp0
railway:signal:distant=DE-ESO:ks
railway:signal:distant:states=DE-ESO:ks2

A marker light should not be tagged as "DE-ESO:kennlicht", as it is not clear if
it is a property of main or distant aspect.

I propose to go back to the past with:
railway:signal:marker_light=yes

That neutral to main or distant.

The minor signal should distinguish between Ra 12 (DV) and Sh 1 (DS).

I propose to tag:
railway:signal:minor=DE-ESO:ds:sh1
or
railway:signal:minor=DE-ESO:dv:ra12

Use ds and dv namespace instead of db and dr, as DB and DR no longer exists, DV
and DS are the official abbreviations used by DBAG.

When tagging signals that are harmonized in DS and DV = Ril301, DO NOT tag this.

Zs6 (Gegengleisanzeiger):
railway:signal:wrong_road=DE-ESO:zs6

Specify form:
railway:signal:wrong_road:form=sign
railway:signal:wrong_road:form=light
A light can also be Zs8. NO SPECIAL TAGGING, as it is not needed. Every Zs6 can
technically show Zs8. If the signal box can't do it, there is no need to tag
this at 

the signal.

Zs7 (Vorsichtsignal):
railway:signal:main:substitute_signal=DE-ESO:zs7

Tagging of the signal ref:
Distinguish between ESTW-Kennzahl and signal ref.
16P3
=
16 + P3
ref:kennzahl=16
ref=P3

That makes it possible to show only the P3 in special applications. When one
needs the 16 he can take it from ref:kennzahl.

Zs3/Zs3v:
Switch over to
railway:signal:speed_signal

Advantage: Possibility to tag a Lf7 at the same position

railway:signal:speed_signal=DE-ESO:zs3
railway:signal:speed_signal:speed=60
railway:signal:speed_signal:form=sign/light (default: sign)

As signals have positions, meaning a km (example: km 18.543) the tag
railway:signal:position=18.543
should be used.

The "Standort" should be tagged as
railway:signal:location=left/right/bridge

The direction should be tagged as
railway:signal:direction=nominal/reverse
regarding to the OSM way.

I know that at least Nakaner will be against ALL my ideas. But that is no matter
for me, as long as he has no real arguments beside of saying that the ideas are
"from me".

Greets

PeterDRS