| EMD Class 66 | 
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| HGK DE 64 at Godorf Hafen  open day. | 
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| | Performance figures | 
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 | Maximum speed | 120 km/h (75 mph) Except Freightliner 66/6 105 km/h (65 mph)
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 | Power output | 2,420 kW (3,250 hp) (total) 2,268 kW (3,041 hp) (traction)
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 | Tractive effort | Starting: 409 kN (92,000 lbf)
 except Freightliner 66/6: 467 kN (105,000 lbf)
 Continuous:
 260 kN (58,000 lbf) @ 25.6 km/h (15.9 mph)
 except for Freightliner 66/6: 296 kN (67,000 lbf) @ 22.5 km/h (14.0 mph)
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The Electro-Motive Diesel (EMD) Class 66 (EMD 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.