Bill Ricker <[email protected]> writes: > On Tue, Nov 22, 2016 at 10:08 PM, Michael Tsang <[email protected]> wrote: > >> > Oh really. Boston MBTA green line is a subway line that extends onto >> > surface streets. Not full rail gauge iirc (though other lines are) and >> > neither surface or tunnel curves could handle freight cars. The surface >> > trolley portions that run down boulevard median are direct line >> extensions >> > of the tunnel line but do have grade crossings at boulevard stoplights. >> Then I think it should be railway=light_rail > > and the way magically transforms to railway=subway at the tunnel portal?
This is the real difficulty. One approach is to tag the 3 parts separately, and the other is to say that if individual trains run end to end, then there should be consistent tagging. So I would lean to railway=light_rail for the entire line, splitting the difference on both sides with subway and tram. Or, it could be reasonable to tag as subway/light_rail/tram as it changes. These changing points are obvious on the ground (first grade crossing, and end of fences to keep cars off tracks).
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