3 Link Couplings & HooksPack includes 8 hooks (plastic) and 24 chain links (metal).0 Gauge Chassis kits and Accessories for scratchbuilders and kit modification.This pack contains sufficient components to assemble four pairs of 3- link couplings.Three-link chain couplings, with no means of drawing the wagons together, were used to form the peculiarly British "loose coupled" freight train: since such trains were not fitted with an automatic through-train braking system there were no pipes to connect between the vehicles.Control of the train was assisted by the guard's van at the rear of the train, or in certain cases a series of vans spaced along the train, which kept the couplings taut and therefore also helped prevent snapped couplings.Such trains travelled at low speeds and were finally phased out in the 1970s.PECO 0 Code 124 Setrack and Streamline Code 124 and code 143 Flexible track systemsA permanent attachment between the hook and link can be made by opening the link and passing it through the small hole behind the hook. It is a snug fit and the hole may need to be opened slightly by using a needle file or similar tool.Ref.: PS624 - Also listed as PS624