7) This engine is a special type known as a ‘Garratt’, and it can haul a train of anything up to a hundred wagons filled with coal. This particular loco-motive is two engines in one. It has four cylinders fed with steam from the boiler in the middle, which is in turn fed with water from the tanks at front and rear. Such engines, which are the most powerful we have, are used for mineral traffic – coal and iron ore. Coal class traffic – of which we carried nearly a hundred and sixty-five million tons in 1949 – is obviously of vital importance to the country.