In message , asdf
writes

LU have a similar tactic to this. Trains of withdrawn 1983 stock are
placed at strategic locations around the network. They are then
allowed to become completely covered in graffiti. Each time one of
these decoys is vandalised, it's one less cleanup job on an actual
service train.

In fairness, that's not the real reason they are parked up there.

They were intended to provide us with some extra stock on the Picc to
enhance what was available. LU isn't exactly blessed with lots of
unused sidings so they ended up stored in places like Uxbridge and South
Arrer.

Once they decided that this plan wasn't going to work, they have slowly
been removed for scrapping. Once of the main problems now is that
they've been there for so long that the only way out is to be lifted
onto a low loader.
--
Steve Fitzgerald has now left the building.
You will find him in London's Docklands, E16, UK
(please use the reply to address for email)