[OSM-dev] MAPNIK - proposal to drop rendering of underground railway lines

Robert (Jamie) Munro rjmunro at arjam.net
Wed May 16 16:00:03 BST 2007

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Nick Black wrote:
> I would like to stop Mapnik from rendering underground railway lines for
> these reasons:
> 1) They make the map look cluttered
> 2) They are not helpful as a navigational or locational aid
> 3) They impede the use of the map as a navigational aid
> 4) They are very innacurate, non-geometrical approximations, derived
> from the location of stations

+1 to removing underground railway lines if you mean "railway lines that
are under the ground" (or replacing them with light-dotted lines or

- -1 to removing underground railway lines if you mean "railway lines that
belong to 'London Underground', some of which run above ground (e.g. in
the suburbs)"

I think the problem may be that it is not obvious what railway=subway is
supposed to mean. Does this mean that the railway is in a tunnel, or
just that it is managed by "London Underground" or similar? Map features
says "A passenger rail service running mostly underground."

What do we tag normal (mainline) train lines that are in tunnels?

What do we tag "London Underground" lines that are above ground? Should
we add tunnel=no to these? Or should we not assume tunnel=yes for

Robert (Jamie) Munro

P.s. would it be possible to use the right colours for underground
lines, and move the parts that are actually under the ground to a
transparent overlay? Or perhaps the overlay could have the colours, but
without it, the overground parts just show as railway lines an normal.
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