1960s and early 1970s, many (if not the vast majority) of Lincoln engineering firms did not survive difficult financial conditions. This included Clayton Dewandre, (that made vacuum and air-pressure brake servos and associated equipment for commercial vehicles). WH Dorman had been bought by English Electric in 1961 and took over an old R&H factory on Beevor Street. Dormans would be bought by Perkins in 1993, then closed in 1995. Only the GEC group of companies in Lincoln (including Dormans) survived the 1970s. The company actually expanded during this difficult time, helped by the fact that 80% of its engines were exported and the North Sea oil industry was rapidly expanding at this time, which required portable electricity generation and heating. Manufacturing plants The original Ruston works (Waterside South, Lincoln) focused on Gas Turbine manufacture from 1967 becoming the head office of Ruston Gas Turbines. Napier Turbochargers, that had been owned by English Electric since 1942, moved to the site from Liverpool. With the change of ownership in 1989 the name was changed to European Gas Turbines Ltd. Following a spell as Alstom Gas Turbines Ltd, the company is now known as Siemens Industrial Turbomachinery Ltd. The design and research centre in Lincoln opened in May 1957. Its gas turbines are still manufactured in the Ruston Works in Lincoln and widely used around the world. Siemens announced in September 2009 that Gas Turbine packaging operations were to move abroad with the Lincoln site becoming a feeder plant. Technically, Ruston & Hornsby Ltd existed at the Vulcan Foundry in Newton-le-Willows in Merseyside until 2002, which was known as Ruston Diesels (former Ruston Paxman Diesels). It was taken over by MAN Diesel on 12 June 2000. Market focus Rustons – in its various incarnations – was always an engine producer rather than a machine producer, and it could be considered that they simply produced machines in order to sell engines. Locomotives Preserved locomotives Heritage railways with Ruston & Hornsby locomotives include : Australia Bennett Brook Railway, Perth, Western Australia Denmark Nordsjællands Veterantog, Denmark France Train de Rillé, France Indonesia Cepu Forest Railway, Indonesia New Zealand Blenheim Riverside Railway, New Zealand Glenbrook Vintage Railway, New Zealand Plains Vintage Railway, New Zealand Pleasant Point Museum and Railway, New Zealand Norway Thamshavn Line, Norway United Kingdom Abbey Pumping Station, Leicester, Leicestershire Amberley Museum Railway, West Sussex Bo'ness and Kinneil Railway, Scotland Bristol Harbour Railway, Gloucetsershire Caledonian