which is exactly what this map of the London tube system uses. The base map is printed directly on PCB, with LEDs along each of the major routes to indicate the current location of the trains.

Map of Railways of South London including City and South London Extension to Wimbledon from 1923 (Image: TfL Corporate ...

London’s Tube is the oldest underground railway in the world, with the first trains travelling between Paddington and Farringdon in 1863. The Metropolitan line was the Underground’s first ...

Hurtling deep underground ... along the Tube route according to this data - but there are many others too. Central London's linguistic diversity is brought into relief by the map below.

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