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Harry Beck devised this with the following simple realization – because most of the system was underground, the physical locations themselves were largely irrelevant to the common person.
Hence, he used lines running only vertically, horizontally, or on 45° diagonals. This is similar to (though not inspired by) the electric circuit diagrams.
What did Harry Beck create, which is considered a standard across the world now?

Show Answer
The line diagram for the London Underground transport system
Since then, the concept has been used for almost all the metro/transport systems across the world.
Watch the Impact of Beck's map on the world around him.
Pre-Beck
prePost-Beck
final scaled