Sitting at home this lunchtime gazing out over a rainswept Shadwell
I've
noted a very odd train on what must be the C2C lines to/from
Fenchurch
Street.

It appears to be roughly (I've only caught the back end of it) 5 all
yellow
coaches topped and tailed with a diesel loco. The coaches are of at
least 2
different types, with what might be a couple of MkIIIs with everything
else
older.

Any ideas what it might be?