Aveling-Barford's works shunting locomotive inthe works sidings at Grantham. While this engine may appear insignificant beside the express and main line locomotives of the adjacent LNER it had an advanced technical feature which none of them shared. It was a 'compound' engine, having separate high pressure and low pressure cylinders, seen mounted above the boiler just behind the rather elaborate chimney. The wheels were powered by a gear drive which is shielded by the cover just in front of ther driver.
From page 11 of a booklet The Works and Products of Aveling-Barford Ltd. Grantham reprinted from British Machine Tool Engineering, July-August-September 1942 issue. Discovery Museum Newcastle ref SE 7558.