An array of lights, one for each tube and DLR station, uses open data from Transport for London to show the approximate positions of the full fleet of trains running along the various lines. As trains enter stations, the corresponding LED will light up. So, at a glance, you can see if the Piccadilly Line is down again.
Not to be outdone, here's the array for Ottawa's LRT on Sunday.
Don't wait for the lights for too long. The system is shut down again!
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