ah i see, there is a claw like thing on the right boggie (may be only rear or both) i believe, I can't find a picture but you can see it when waiting in the block brakes, it is a light grey look and pivots.That's very informative but it's the wrong chain (super cools to see John back when he was younger tho lol) it's the grab chain that pulls you around the curve that's puzzling me^^