Tried to do a search for this but haven't come up with anything, mostly as I can't think what to try, Class 66 brake problem comes up with results for brake problems on a lot of loco's.
Basically, I just tried a run I made with a Class 66 (EWS version, with AP Enhancement) and 24 loaded BZA steel coils. Feels heavy, drives as I imagined it would with such a load and all was well until I slowed down for a red. The brakes were very sharp, speed slowed much quicker than I expected it to so getting close to the red signal I was down to about 10-15mph or thereabouts and was about to stop rather early, so I released the brakes and much to my surprise it slingshot forward and the speed ramped up to 30mph and I went flying through the red
I reversed backwards to come back to the red signal, then noticed that any other time I had to release the brakes on the move, I'd get the same problem, so say I wanted to slow down for a 50mph limit, I'd slow my train down to about 30mph then I'd release the brakes, as the train would then fly off rocket up to 45-50mph.
I've driven the Class 66 (EWS one, with AP enhancement) on various other loads before and I can't recall (off memory mind!) having this problem before
It drives fine otherwise, it's just rather tricky with the brake situation. Anyone else by any chance had this or noticed it?