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 <matkoni...@tutanota.com> 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 selfishseaho...@gmail.com: > > 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 <colin.sm...@xs4all.nl> wrote: > > > > On 9 December 2018 17:37:21 CET, Markus <selfishseaho...@gmail.com> 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. _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
