Some time ago now I noticed the display panel hung off the railways at the top of Platform 2, or thereabouts, at Waterloo. See for, example, reference 1.
Coming home from the outing which is about to be posted, I happened across it again.
Readers are invited to play spot the difference. Of which, I can assure them, there are some. For example, we have moved up from version 7.4 to version 7.6 - from which we deduce that it has been upgraded in the wake of the summer reconstruction project (plenty of evidence for which is still lying about outside the station). In the course of spotting the differences, I started to make a bit more sense of it than I had at the last occasion.
First, the display covers the tracks from Waterloo top left to Earlsfield bottom right. I had thought it was just the immediate approaches to Waterloo.
Second, the little green, red, white and open spots stand for the signals. And I think the little blue line indicates the direction from which the signal is intended to seen.
Third, west crossings is a wheeze whereby trains can cross the tracks from the far east to the far west. More accurately, from the far southeast to the far northwest.
Fourth, the bridge bottom left is the viaduct which used to carry the long trains from Europe over the tracks to the right side of the station for what was the Eurostar terminal.
Bit more time needed on the little rectangles with identifiers inside them. If they are all trains, the station is rather more crowded than I think it ought to be.
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