Roland Perry wrote:
In message , at 08:52:31 on Thu, 2
Oct 2014, Walter Briscoe remarked:
A train failure at Tottenham Court Road before 0700 resulted in no
Central Line service between Liverpool Street and Marble Arch until
about noon.
Alternative reports of emergency engineering works made me guess the
failed train hit something.

Before or after it failed? (I think things have dropped off trains in the past).

Yes, driving motors came loose on 92TS a few years ago, and at least one
fell off, derailing the train:
http://news.bbc.co.uk/1/hi/england/2786565.stm

There was also an incident in July 2007 when a train derailed after hitting
some materials that had been badly stowed in a cross passage after weekend
maintenance:
http://www.raib.gov.uk/cms_resources...8_Mile_End.pdf