EWS placed the biggest order for Class 66s - with 250 locomotives. They work the length and breadth of the country on all manner of duties and have allowed withdrawal of twice as many older and less reliable locomotives. On June 16, 66179 works a Shoeburyness-Didcot MoD train past Chalkwell on the c2c commuter route. This train used to be worked by Class 47s and more recently Class 37s.
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