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The Earl of Airlie was one of those built for the Dundee and Newtyle Railway - 4ft. 6in. gauge - of which the first town were put to work in September, 1833, and the third in March 1834. The vertical cylinders, 11in, by 18in,w ere placed on the outside framing at the centre of the engine, and the piston-rods which issused from the tops were connected through bell-crank levers as shown. The front or driving wheels were 5ft. in diameter and the pressure 50lb per square inch.
The trailing end was carried on a four-wheeled bogie with 3ft. wheels, and these were the first bogies to be fitted to railway locomotives for work in this country. The weight was about 9. 5 tons in working order and the engines cost £700. One of these engines, The Earl of Airlie, was at work until 1850, after which was used as a pumping engine, The late Mr Alexander Allan had it put into order and photographed.