Date: Sun, 9 Dec 2018 22:30:26 +0100
From: Markus <[email protected]>
To: "Tag discussion, strategy and related tools"
<[email protected]>
Subject: Re: [Tagging] Feature Proposal - RFC - Railway tracks on
highway
Markus' original point is well taken. Some mappers may not know or care
which type of vehicle runs on the tracks, only that there are embedded
rails in the roadway. In this case embedded_rails=yes would be appropriate.
Mark
Thank you, Mateusz and Colin, i haven't thought of curve radii and signalling.
By the way, i deliberately didn't mention the Bordeaux system because
it's uncommon and not a metro (but some kind of tram).
Regards
Markus
On Sun, 9 Dec 2018 at 20:46, Mateusz Konieczny <[email protected]> wrote:
In Kraków, Poland trams and train use the same gauge and in
theory it is possible to build vehicle that would travel both on
tram tracks and railway tracks.
But railway tracks are build to withstand significantly heavier
vehicles and with massive differences in curve radius:
railway curve with small radius:
https://www.openstreetmap.org/?mlat=50.0433&mlon=19.9617#map=15/50.0433/19.9617
tram tracks curve with small radius:
https://www.openstreetmap.org/?mlat=50.0438&mlon=19.9471#map=15/50.0438/19.9471
So I would expect a difference.
BTW, first tram in Kraków had deliberately narrow gauge to make impossible
to convert it into railway tracks through a city center.
Dec 9, 2018, 5:37 PM by [email protected]:
Hi!
I'm still wondering if there is a technical difference between
embedded tram, train and now metro rails (except for a third rail,
which usually can't be embedded in a street). If the only difference
are the vehicles that run on them, then it doesn't seem to be
important to distinguish between embedded_rails=tram/railway/subway
and embedded_rails=yes probably is enough information. (By the way,
why did you leave out light_rail and narrow_gauge?)
On Sun, 9 Dec 2018 at 21:40, Colin Smale <[email protected]> wrote:
On 9 December 2018 17:37:21 CET, Markus <[email protected]> wrote:
Hi!
I'm still wondering if there is a technical difference between
embedded tram, train and now metro rails (except for a third rail,
which usually can't be embedded in a street).
It can and is popular in France.. Check out APS (alimentation par sol).
A major difference between heavy rail and trams is signaling. Rail systems are
heavy on safety interlocks whereas trams basically rely on the driver as they
have to interact with city traffic. Points (switches) for trams are controlled
by the drivers on demand, whereas for trains they are set for centrally
determined paths. I suspect that point motors for trams are happier at being
forced open at trailing junctions as well. Big train point motors take a dim
view of that.
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