Yep there is one out and about - 378 005 - on the North London Line
although its first run started at Clapham Junction this morning. It
was on the 1157 from Richmond and should be the 1307 ex Stratford back
to Richmond. I saw it at Highbury & Islington but couldn't spare the
time for a ride on it. Looked very shiny and it certainly moves
quickly enough. Photos later although there are already shots by
others on Flickr.

--
Paul C
via Google