In message , David A Stocks
writes

The Tyburn flows in a huge pipe over the platforms at Sloane Square
underground station. OMG, we're on-topic!

Correction, the river at Sloane Sq is actually the Westbourne, related
to the Tyburn brook, which is *not* related to the River Tyburn!

The Tyburn River crosses the Circle Line in a similar pipe at Baker
Street. See the top two pictures at:

http://londonist.com/2008/12/lost_ri...e_tyburn_2.php

I think there may be a similar construction at Victoria, although I
don't know if it's visible from the platform. There's some doubt about
the most southerly part of the course of the Tyburn, but it's thought
that Tachbrook Street in Pimlico commemorates the route of one of the
branches of the river.
--
Paul Terry