On Wed, 27 Mar 2019 05:37:31 -0500, Christopher A. Lee
wrote:

On Wed, 27 Mar 2019 07:12:33 +0000, Roland Perry
wrote:

In message , at 23:24:39 on
Tue, 26 Mar 2019, Charles Ellson remarked:

I think the train behind is then instructed to proceed slowly and couple to
the stalled train ahead.

Alternatively, it can be instructed to reverse to the previous station.

Not normally done on LU AFAIAA

I'd ask Recliner if he's ever seen a report of the activity he describes
taking place.

My old man worked on the Met, rising via yard manager at Neasden and
station master, to becoming an area manager.

He told the story or some bright young manager ordering an 8-car train
of A-stock to couple up behind another 8-car train that had failed.
Making it too long for a short section - the average block length is
about 300 metres so some are shorter, and a 16-car A-stock train would
be 256.

So it would occupy three blocks at a time.

I have no idea how it was sorted out.

It would not have been a rare version of assistance on the
Underground. Depending on where/what the fault was there would have
been the opportunity to rearrange into different combinations of
4-coach units but the main problem might not have amounted to more
than isolating the tripcock on the rear 8 set to conform to the
standard practice of only the end vehicles having an operational
tripcock (if you didn't disable the trips on the middle cabs of an 8
coach train you would get tripped all day).