please empty your brain below

as regards the 'circle' line indicated for Tokyo, I assume you refer to the Yamanote line - but I don't think you can call it a 'tube' line - my recollection is that it's mostly elevated !

I didn't call them tube lines.
The linked website calls them Metros.

And, of course, London's underground used to have several circles:

http://en.wikipedia.org/wiki/File: The_Circle_Routes_of_Victorian_London.png

Sydney produced its own version of the tube map in 1939 to promote its city underground railway. This was a blatant copy of the London map of the era.
http://www.flickr.com/photos/36844288@N00/3866891031/in/photostream/

St James and Museum railway stations were also modelled on tube stations.

Does Amsterdam count as an out and back loop?

The old London Circles weren't wholly Underground, though.

With the reopened East London Line, it would now be almost possible to reconstitute the Outer Circle, though its terminus, Broad Street, is missing.

... ooops.....I guess I shouldn't have paid so much attention to the heading 'Tube geek' - but I am just as happy to go 'Totallay Metrolar' for 5 days of fascinating DGeekery

The old London circles weren't complete circles either - e.g. Broad Street to Mansion House via Olympia

@Timbo: And of course, none of them, including the actual Circle Line is a circle.

And the Circle Line is no longer a complete circle, more a spiral made up of the "Inner Circle" and "Middle Circle".



Both Moscow and Berlin did draw their circles as circles on the map at some point - the Berlin map in question may have inspired Mr Beck, coming shortly before his map.

The Berlin one, though, isn't on the underground, in either the literal or the "railway company" sense. It's on the S-Bahn, the metro-style lines owned and run by the national railway company, Deutsche Bahn. The Berlin Underground, for comparison, is owned and run by the State of Berlin.












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