Hello, First time posting here, forgive if I've missed some rules.
Summary: I wanted to refine tagging of some tram/streetcar tracks to show what they're used for, and found this isn't standardized and isn't documented. I would like to suggest updating wiki for Key:service to specify recommendations for railway=tram: 1. no service tag recommended for tracks that are regularly used in scheduled service, including loops and tail tracks 2. service=yard for tracks within and leading to tram storage and work areas ("yards", "garages", "depots" - where trams are parked overnight, maintained, light repairs) 3. service=siding for tracks not used for normally scheduled passenger service (including diversion-only, emergency, non-revenue trackage, as well as turn tracks not used in scheduled service) 4. service=crossover for crossover tracks (where dual-ended trams change direction - only use between two main tracks with no service tag - otherwise use service tag of the tracks that are connected) Currently I suggest no change for railway=light_rail as they seem substantially different and I have not checked on their tagging. Background: In Toronto we make a distinction for "non-revenue trackage" on the streetcar/tram system. These are tram/streetcar tracks that are not normally used for carrying fare-paying passengers in scheduled service, but may be used for detours if needed due to construction or accident. Currently most of these are not tagged specially. My first instinct was to tag non-revenue as service=siding, but this doesn't match the wiki definition. Bay Street is one such case: https://www.openstreetmap.org/way/9454845 Another example I'm familiar with is Alte Schönhauser Str. in Berlin, where tracks were retained after a new tram route was built, and - as I understand it - are used in special cases: https://www.openstreetmap.org/way/153424801 On-ground difference might be that standing street-side, on normal track one might see a tram go by every 5 minutes, whereas on non-revenue trackage at least hours and possibly days might go by between trams. This might be particularly common in cities with larger networks and "legacy" networks of interconnected lines. Similarly, tracks leading to garages/yards would only be used by trams going into and out of service with no passengers on board. Apart from de-emphasizing less important lines when rendering, data consumers might be interested in this information to avoid routing vehicles near transport corridors (likely to be busier, have more pedestrians), or to estimate length of active vs support track. Public transit routers could use it to estimate route taken in absence of path/shape information. Currently this is not documented in https://wiki.openstreetmap.org/wiki/Key:service (only sections for highways and heavy railways are included), seemingly in any of the wiki languages. https://wiki.openstreetmap.org/wiki/Tag:railway%3Dtram includes only "service=yard - if it is a sidings (sidings, tracks in depots)" which seems to me unsatisfactory. It appears osm-carto currently renders service=yard, service=spur, and service=siding with a thinner line at zooms 16 to 18, and hides them at zoom 15. service=crossover does not seem to get special rendering. Actual tagging currently on the map varies - I've attempted an overview below. Trams' service=yard seems currently used fairly widely for tram garages/depots. This is not the same as railways' "yards" on the English wiki page, but DE:Key:service does include it as "Betriebswerken, Ausbesserungswerken usw" ("works/depots, repair shops, etc"). My questions: - are there other approaches used elsewhere that I've missed in the overview below? - any comments on the scheme suggested above please? in particular the choice of service=siding or service=spur for non-revenue trackage - any support for beginning use of tram-specific values, for example service=loop, or service=non-revenue? Overview of current tagging in cities I'm familiar with: - Berlin, Alte Schönhauser Str. (described above): https://www.openstreetmap.org/way/153424801 has service=siding - Berlin, S Adlershof loop (former terminus, as I understand it not normally used) https://www.openstreetmap.org/way/139964269 has service=siding - Berlin, Travestr. loop (used as terminus) https://www.openstreetmap.org/way/167791954 has service=yard - Berlin, S Warschauer Str. tail track (used very frequently, by empty streetcars) https://www.openstreetmap.org/way/11273262 has service=yard - Berlin, Roederplatz, turn track not used in scheduled service https://www.openstreetmap.org/way/23913897 has service=yard - Toronto, Earlscourt loop (scheduled for use but only for couple of trips a day) https://www.openstreetmap.org/way/530112420 has service=siding (and did so before my edit) - Toronto, Vaughan Road track (only streetcars entering/exiting service) https://www.openstreetmap.org/way/9406754 has service=spur - Toronto, Bathurst Street track right next to the Vaughan Road one and with same use https://www.openstreetmap.org/way/9406756 has no service tag Elsewhere - with the disclaimer that I'm not familiar enough with those systems to know for sure if track is not in regular use: - München: garage tagged as service=yard https://www.openstreetmap.org/way/39772979; track connecting to garage https://www.openstreetmap.org/way/134136316 has name=Betriebsstrecke but no service; no special tagging found on loops or sidings - Rostock: garage tagged as service=yard https://www.openstreetmap.org/way/177283575 - Warszawa: it appears there is generally no special tagging on loops, I saw only one stray service=yard on one part of a loop at Marymont https://www.openstreetmap.org/way/132578934; yards/garages have service=yard https://www.openstreetmap.org/way/35071413 - Poznań: i saw service=spur on a tail track and loop siding https://www.openstreetmap.org/way/79212680; on a (not normally used?) loop: https://www.openstreetmap.org/way/411526161; service=yard on garage access https://www.openstreetmap.org/way/169626913 - Melbourne: service=yard used in garages https://www.openstreetmap.org/way/514050081. Two of tail tracks I saw (possibly non-revenue?) have service=siding https://www.openstreetmap.org/way/131710566 and https://www.openstreetmap.org/way/217908885, but most are not specially tagged. - Kyiv: I saw https://www.openstreetmap.org/way/169506761 with service=yard but the nearby big garage (for example https://www.openstreetmap.org/way/474572333) has no tags - Moskva: service=yard in garage https://www.openstreetmap.org/way/300291789; no special tagging observed on loops and tail tracks - Oran: I found service=spur in garage https://www.openstreetmap.org/way/369894648 but "main" tracks within garage have no service - Tunis: service=spur for tail track https://www.openstreetmap.org/way/613871674; service=siding for tail track elsewhere https://www.openstreetmap.org/way/455682216; but this seems to be a borderline "light metro" with tagging changing to light rail e.g. https://www.openstreetmap.org/way/32843642; service=yard on garage https://www.openstreetmap.org/way/100552956 - Casablanca has one garage tagged service=yard https://www.openstreetmap.org/way/633261819 but otherwise not much detail - Ko-hiông: https://www.openstreetmap.org/way/501281475 service=yard in garage - Dubai https://www.openstreetmap.org/way/548105683 service=crossover on a crossover-like trail track; service=siding on third platform track https://www.openstreetmap.org/way/548105724 - Tiānjīn: one tail track (perhaps not normally used?) https://www.openstreetmap.org/way/404273780 has service=siding, crossover track https://www.openstreetmap.org/way/24908482 has service=crossover - Huái'ān: service=crossover https://www.openstreetmap.org/way/404937817, service=spur in yard https://www.openstreetmap.org/way/404825327 but service=yard right next to it https://www.openstreetmap.org/way/404825287 - Zhūhǎi: service=yard in garage https://www.openstreetmap.org/way/566567307; service=spur on crossover track https://www.openstreetmap.org/way/566567291 - Tōkyō: Setagaya Line: service=siding found on https://www.openstreetmap.org/way/454683030 (used for parking trams?), Toden Arakawa Line: https://www.openstreetmap.org/way/180140854 service=yard in a garage/yard - Sapporo: https://www.openstreetmap.org/way/640855721 service=spur in the garage/yard; https://www.openstreetmap.org/way/640855704 service=siding on a tail third track; https://www.openstreetmap.org/way/640855706 service=crossover on a crossover that also serves as entrance to the tail track Thanks for any input! Jarek _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging