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Something similar is often used for railway lines. Even Wikipedia has it on some pages, eg. https://en.wikipedia.org/wiki/Great_Eastern_Main_Line https://en.wik

by helb 10y ago

Something similar is often used for railway lines. Even Wikipedia has it on some pages, eg. https://en.wikipedia.org/wiki/Great_Eastern_Main_Line https://en.wikipedia.org/wiki/Great_Eastern_Main_Line