In message , at 13:25:24 on
Wed, 9 Nov 2016, David Walters remarked:

The Guardian are quoting a TfL source as saying
"the incident happened inside a tunnel" -
https://www.theguardian.com/uk-news/...ped-40-injured

Which suggests it was running north towards Sandilands Station and
something had happened inside the tunnel.

Frustrating that there's no definite reporting of its direction.
--
Roland Perry