Multiple sources confirm that a new batch of Class 66s will be built for the UK market. The 23 locos in question will be quite similar to the JT42CWRM, especially when it comes to updated emission specifications. The 23 units are foreseen to enter service with various operators, with GBRf being one of them.

Many think this order is the first one for new Class 66 locomotives since the closure of EMD's London plant and the introduction of strict European emission standards. However, under Progress Rail also a batch of 4 new JT42CWRM locos was built for SETRAG from Gabon in 2011. The British batch is most likely to be built at Progress Rail's Muncie plant, just like the SETRAG units. Delivery of unit 23 is scheduled before December 2014.