A good older model by Cherry Scale Models (with makers plate on underside) of LMS 4-4-2 'Tilbury Tank' No. 2157. The slightly noisy motor could be a Sagami or similar, fitted with multi stage gearbox and solid cast wheels. With very good cab detail.  To a Whitelegg LTSR design this loco entered service from Derby Works in February 1930 and was withdrawn from Spital Bridge in November 1959 as BR 41975. Lightly used. £750.