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Re:France Says It Will Ban Uber’s Low-Cost Service in New Year by corin_ on Monday December 15, 2014 @09:21AM (#8752051)
London and Tokyo are both also not 24/7 (although London announced a couple of months ago that some central lines would move to 24/7 in the next few years I think).
Re:France Says It Will Ban Uber’s Low-Cost Service in New Year by jarek on Monday December 15, 2014 @09:25AM (#8752066)
London Underground will also be 24 hours on Friday and Saturday nights only, again due to requirement for maintenance timeslots. More info http://www.tfl.gov.uk/campaign/tube-improvements/the-future-...

Also note that "night service" on NYC subway can sometimes be every 20 or 30 minutes and run alternating on one track