 Later locomotives had rigid connecting tubes with the necessary flexibility provided by metal ball-and-socket joints similar to those used in laboratory glassware.Fuel and water were carried on the locomotive, in side tanks beside each boiler for the water, and bunkers for the fuel above them.Armed with the success of "Little Wonder" on the Ffestiniog, Fairlie staged a series of very successful demonstrations on the Ffestiniog line in February 1870 to high-powered delegations from the many parts of the world.