On 2016-03-07 09:23:47 +0000, Someone Somewhere said:

"London Overground: No service between between Highbury & Islington and
Dalston Junction due to congestion"

Anyone care to explain? Is this people at the stations (in which case
wouldn't shifting them help?) or trains (in which case wouldn't
shifting them help?)?

That's odd. It can't be the trains surely as nothing else runs on the
lines. Maybe it's a mistaken announcement and it's a broken down train
or signals.

E.