On Sun, 22 Jul 2007, Steve wrote:

OK, here's a question. If (and it's a big if) an additional line is
opened at some future point, what colour will provide maximum contrast
with all existing lines.

ISTR official maps showing Chelsea-Hackney in lime green. Quite repulsive.

(Pratchett fans may NOT nominate octarine.)

One of the shades of black not currently in use, then?

tom

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Only the bagel has the correct aspect ratio.