On 4 Apr, 23:36, wrote:
Apparently DLR staff have been a bit cagey about it all day. [...]

Variously described by the DLR staff I asked as a derailment, a power
problem, a failed train and "just an incident, I don't know anything
more than that".

I got myself caught up in this yesterday as I basically had had a free
day and was out and about in the Docklands, I'll report back with a
bit more about how the service coped with this all (in essence fairly
well, but on-the-spot information provision could nonetheless have
been a bit better).