text: In September 2013, GB Railfreight announced a new order of a further 8 Class 66/7 locomotives from EMD, the first of the class to be built at EMD's Muncie, Indiana plant. On 2 February GBRf ordered a further 13 locomotives. These 21 locomotives are numbered 66752-772. Numbers 66752-756 were shipped from America and arrived at Newport Docks in July 2014. No. 66752 has been named The Hoosier State, a nickname for Indiana. A further seven locomotives (66773-779) were later added to the fleet, utilising six power units that had been in the UK, plus one recovered from the scrapped 66734. The presence of these power units in the UK circumvented European emission compliance regulations and permitted them to be exported to EMD Muncie for installation in further class 66 bodyshells.
  Emission compliance
  Numbers 66752-779 were the last Class 66s ordered for service in Great Britain because of increasingly stringent emission regulations. 66779 was the last Class 66 ever to be built. Although the Class 66s meet stage 3a of the regulations, they do not meet stage 3b. Stage 3b would have required additional exhaust treatment equipment that could not easily be accommodated within the UK loading gauge. The same restrictions apply to the  and Class 70. The restriction does not apply to second-hand locomotives, provided that they are imported from within the European Union. The purpose of the regulation was to put a cap on the total number of non-compliant locomotives in the EU.
  Current operators
  Colas Rail
  Colas Rail took over the ex-Advenza Cemex Cement flow after the company went bust, initially using the five former Advenza Freight and Direct Rail Services locomotives 66406-410 which had been renumbered 66841-845. Subsequently, as part of a deal with GB Railfreight, Colas Rail replaced them with five ex-Freightliner 66573-577 which were renumbered 66846–850. The five ex-Direct Rail Services class 66s were transferred to GB Railfreight and renumbered 66742–746.