The suburban/regional rail network in Tokyo is very extensive--these maps show how much ground is covered by the principal JR lines (ie excluding all subways, private railways, and other minor railways)pic.twitter.com/cb0jbqKVw7
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in fact the old Network Southeast sector covered all that area and even had a line to Exeter, 170 miles from central London
london's is similar in extent; rail routes to places like Brighton are in effect outer metro trains though not branded as such
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