I have in the last couple of weeks bought 5 Class 66’s in the £95 to £119 price range. I check them by setting them on a piece of glass and everyone of them sat very unstable and also ran with a wobble.
So I removed all axle boxes and they would then sit perfectly and run excellently.
I then glued the axle boxes into the side frame and cut the excess off at the back.
I now have the 5 best running locomotives that look fantastic compared to the other versions available
at bargain prices granted without rotating axle boxes and 20 minutes work each.