[Tagging] Feature Proposal - RFC - 3rd and 4th rail (Michael Reichert)

[Paul Allen]

On Sat, 13 Jun 2020 at 17:50, Garry Keenor <garry.keenor at gmail.com> wrote:

> Paul - thanks for the response. I struggle with the idea that someone
> would know that a route is electrified with a ground level contact system,
> but not how many rails there are. The possible sources are a) local
> knowledge,
>

Or local-ish knowledge.  On-line newspaper article saying the line has
been electrified (I'm local to me, and I know how to use the internet; the
newspaper is local to the line).

b) wikipedia
>

Never trust wikiepedia. :)

and c) aerial imagery.
>

Sometimes aerial imagery is crappy.  Good enough to see that there are
no gantries for carrying an overhead line but not good enough to count
rails. Unlikely, particularly on a long line, but possible.


> All of these will, 9 times out of 10, define the system. Also, there are
> only 2 networks that I can identify worldwide that are 4th rail, and I've
> tagged them both already. :-)
>

So when 8 more networks are converted to 4th rail, there's a risk that one
of
them (using your figures) can't be pinned down. :)

I assume that more networks will be converted over time, or new ones will
be built as 4th rail.  Or will they?

-- 
Paul
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