Looking at the District line WTT, I noticed in the depot workings section at the front that there are H&C trains starting and finishing at Upminster, and running in service to and from Upminster. Some of these are marked as Runs As Required, but some are full-time. I don't know why either of these are there. How long have these run? I have never heard anyone mention them along with other rare tube services. It can't be because of lack of space at Barking, because there are a few District trains stable at Barking as well.