To be clear, "infrastructure" tagging as I described it doesn't necessarily
come first, it (only) would if an existing rail line needs to be entered into
OSM, then might be repurposed as a light_rail line. If there is no rail to be
repurposed, and it is brand-new-from-scratch passenger rail, skip that first
part and wrangle when it is best to first enter "proposed," then "construction"
and finally (as ribbons are cut), turning those infrastructure into passenger
service lines. For trains and light_rail/tram these are slightly different:
for trains, you have BOTH a route=railway relation and a route=train relation,
for light_rail, you can do it with a single relation that represents both the
physical / infrastructure elements of the rail AND the passenger-oriented
members of the single route=light_rail relation (like platforms and stop_area
members).
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