Roland Perry wrote:
In message
-septe
mber.org, at 10:16:47 on Wed, 23 Nov 2016, Recliner
remarked:
I'm regularly seeing tweets from the Piccadilly Line that say that there's
a shortage of available trains. Is this some newly discovered technical
problem, or the result of union action? This fleet is regularly reported
as LU's most reliable.

Here's an example from this morning: "Apologies for the gaps in the
service, this is due to lack of available trains. Our staff are working
hard to resolve this issue."

Could be leaf-fall wheel flats. A lot of the Piccadilly line is in the
open air.

Sounds plausible. The week-old problem is continuing today, but they're not
identifying any specific problem(s) on Twitter:

"hi, we don't have the specific reason but they are working hard to get any
unavailable trains back in service as soon as possible"

Incidentally, although the Piccadilly line is largely above ground from
Baron's Court, it's largely on viaducts rather than cuttings, so it
shouldn't be affected very much by leaf fall.