On Monday, 15 February 2016 14:55:06 UTC, wrote:
Can you imagine any tube line being
closed for that many consecutive days now unless there had been a major
incident?

Yes, the Victoria line was closed from Seven Sisters to Walthamstow for 3 weeks last summer.

Closed all the way from Highbury down to Shadwell. Since TfL were apparently
too shortsighted to specify reversing points at Shortditch High Street when
the line was built and the route of crossrail was already known.

9 days seems a long time for trains to be cut off from their depot. Where would they be stabled and cleaned, and where would the drivers book on? (And where would they park their cars!)