I don't travel much on the DLR anymore, about twice a month off peak. I usually try and sit at the front. Almost Every time in the last 6 months I have been asked to move by the PSA so he can control the train. Are there any publicly available stats about how often PSA take control per day / week? The helpful chap I spoke to said it was several times a day (for him), especially during the summer when the signalling was on the blink.