The Electro-Motive Diesel (EMD) Class 66 (or JT42CWR) are Co-Co diesel locomotives built by EMD for the European heavy freight market. Designed for use in Great Britain as the British Rail Class 66, a development of the Class 59, they have been adapted and certified for use in other European countries. Outside Europe, 40 locomotives have been sold to Egyptian Railways for passenger operation. A number of locomotives built for Euro Cargo Rail in France with roof-mounted air conditioning are classed Class 77. In Germany ECR units operated for DB Schenker were numbered as class 247, re-classified as class 266 by the Eisenbahn-Bundesamt to match other Class 66 locomotives operating in Germany. History United Kingdom The class was designed by General Motors-Electro Motive Division for use in the UK, and 250 were sold to English Welsh & Scottish, with orders from Direct Rail Services, Fastline, Freightliner and GB Railfreight. Ireland While not exactly a Class 66, a mixed-traffic version operates on the island of Ireland, being owned by Iarnród Éireann and NI Railways. The 32 were ordered after the economic boom with 2 extra ordered by NIR from their supplier EMD; the first one was delivered in 1994 after being flown from London, Ontario to Dublin Airport by an Antonov An-124 Ruslan, with the rest of the class arriving by ship in the following months. Mainland Europe With the locomotives proving successful in the UK, interest came from railway operators in continental Europe. General Motors locomotives in mainland Europe had historically been produced under license by local manufacturers. The high haulage capacity and reliability of the Class 59 (JT26-CW-SS) had led to its use by the German company Häfen und Güterverkehr Köln (HGK). The first mainland Europe order also came from HGK, for two locomotives, followed by TGOJ Trafik () in Sweden. Subsequently, many European railway operators bought locomotives. Class 77 With a high number of orders, EMD modified the locomotive for European ECR operations, including: Powered by a 12-cylinder 710 engine that meets EU Stage IIIA emissions regulations, via latest EM2000 control system DC traction motors, rated at Enhanced gear case, which increases tractive effort to , making the locomotive suitable for heavier European trains ECR Train Protection System allowing for immediate certification for operation in France, Germany and Belgium, but meaning that they cannot operate in Great Britain Additional driver facilities, including cab air conditioning; a microwave and