Topsy - Ruston & Hornsby Engineering Company began work in 1867 producing threshers, excavators, pumps, mills, steam, gas, petrol, oil engines, and diesel locomotives. Through several mergers and take overs the company is now part of the Alstom Group. Diesel locomotives such as this were built between 1931 and 1967. Topsy was constructed in 1961 - Date/photographer unknown.