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While "surfing the internet" I came across a YouTube Video about the Metropolitan Line in London.  It showed what appeared to be full scale 3R track.  Well did more research and "son of a gun" found out the Underground System in London still uses that set-up, although it is actually 4R.  In addition to the 3R track there is an outside rail.

https://en.wikipedia.org/wiki/..._and_tube_trains.jpg

https://en.wikipedia.org/wiki/...round_infrastructure

http://www.trainweb.org/tubeprune/tractioncurr.htm

Anyhow checked and the last time there appeared to be a discussion on the forum was back in 2013 (lots of back and forth).  So thought I would start a new topic explaining it to new members which might be as naive as I am.  So similar to what one of the forum members has in his tag line if 2R is good, 3R must be better, then 4R must be amazing!

So instead of trying to hide the center rail, maybe we should be adding another rail???  I dunno?

Last edited by MainLine Steam
Original Post

The 4-rail London Underground also incorporates the Thames Tunnel (Rotherhithe to Wapping), originally built for pedestrian and carriage traffic between 1825 and 1843 by Marc Brunel and his more-famous son Isambard K. Brunel, engineer of the 7-foot gauge Great Western Railway and the gigantic iron steamship Great Eastern. The planned sloping descents to the tunnel at each end for use by horse-drawn carriages were never completed, and so the tunnel originally carried only foot traffic.

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