It is expected to be the last ‘66’ taken on by a UK operator. GB Railfreight took delivery of the last of a batch of 11 Class 66s, sourced through Akiem from mainland Europe, on September 2. GB Railfreight took delivery of the last of a batch of 11 Class 66s, sourced through Akiem from mainland Europe, on September 2. It is expected to be the last ‘66’ taken on by a UK operator. GBRf now has 115 Class 66s in its fleet, 66701-799 and 66301-316 although some of the 667xx locomotives are now being renumbered in the 66/6 number series.