Two connections are not always proof of no runaways. A year ago while running the "Newbie Project" as in Live Steam right now, I had a derailment which caused the short driving/fuel car to stand on end. The knuckle coupler on the car dropped below the one on the loco and the front frame member of the carriage dug into the aluminium railhead causing it to stop instantly. There was a single safety chain and it promptly straightened out the hook on the driving car while the locomotive proceeded resolutely along the rails! Fortunately, I had almost totally closed the throttle before getting dumped in the ballast, so the loco was only running at a good walking speed around a loop where I intercepted it after extracting myself from the ballast and grass. The driving carriage is now a wooden gondola and has two safety chains in addition to the knuckle coupler. Unka Jesse > After that incident, as Track Marshall I updated the Risk Assessment (sorry > for swearing) and we brought into use a new rule that stated that > locomotives and driving trucks must be attached by two separate and > independent means. (That is they could share the same buffer beam etc, but > not the same fixing. MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.