Surely there's some kind of scale for measuring how packed a tube carriage is? There is now — we've just invented it!
Geoff hops onto the Northern line to show you exactly how it works.
Surely there's some kind of scale for measuring how packed a tube carriage is? There is now — we've just invented it!
Geoff hops onto the Northern line to show you exactly how it works.
Last Updated 15 December 2016
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