Colin, Thanks for your comments.
I want to clear one very important thing up. The tag electrified=* is currently being used in OSM to define the *contact system* in use, not the power supply. All railway electrification systems require a sliding contact between train and infrastructure to transfer electrical current. Your point about 2 rail systems is a valid one; there may be examples of conventional railways with very low voltage 2 rail electrification. We could use electrification=2nd_rail or electrification=2rail. Maglevs, by definition, do not have any contact with the infrastructure and the entire propelling force is derived within the track system. So electrified=induction would be more appropriate. best regards, Garry On Thu, 11 Jun 2020 at 12:52, Colin Smale <[email protected]> wrote: > On 2020-06-11 13:28, Peter Neale via Tagging wrote: > > At the risk of being called pedantic, or frivolous, surely it should be, > "1st+2nd+3rd+4th rail" (after all, it won't work without the 1st and 2nd > rails)! > > ...or (almost getting serious now) we could just assume that, if the 3rd > rail is mentioned, then the 1st and 2nd must be there (otherwise it > wouldn't be 3rd rail) and, if the 4th rail is mentioned, then the 1st, 2nd > and 3rd must also be there. > > There might be a maglev system somewhere using two conductor rails, which > would then be the 1st and 2nd? > > Remember we are discussing the power supply, not the running rails. The > power supply only needs the 3rd and 4th. Take away the running rails, jack > up the train, and you could still get the motors to turn (safety systems > permitting). > > A serious question arises though... The Wuppertaler Schwebebahn get its > power from the 2nd rail (it's a suspended monorail). What do we do with > this? electrified=2nd_rail? > > > _______________________________________________ > Tagging mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/tagging >
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