British Rail Class 66
Sub-classes
Minor differences between different orders, and different operating companies have resulted in a number of subclasses being defined.

British Rail Class 66

Section Title: Sub-classes
Table Section Text: Minor differences between different orders, and different operating companies have resulted in a number of subclasses being defined.

Subclass	Number built	TOPS number range	Operators	Comments

66/0	240	66001-66007 66009-66015 66017-66045 66047 66049-66057 66059-66080 66082-66131 66133-66140 66142-66183 66185-66237 66239-66249	DB Cargo UK	The original order of 250. 66 048 written off after Carrbridge derailment.

66/3	5	66 301-305	Direct Rail Services	Originally ordered by Fastline Freight. Now in use with Direct Rail Services.

66/4	10	66 411-420	Freightliner	Acquired from DRS in 2011. Three exported for use in Poland (FPL), 66 411, 66 412 & 66 417.

14	66 421-434	Direct Rail Services	Intended use is on intermodal traffic. Occasionally used on nuclear flask traffic – for which they are overpowered.

66/5	94	66 501-520 66 522-572 66 585 66 587-599	Freightliner	Replaced Class 47s and Class 57s on Intermodal freight. 66 521 written-off after Great Heck rail crash.

66/6	19	66 601-607 66 610 66 613-623	Freightliner	Top speed of 65 mph (105 km/h) – reduced gearing to cope with heavier oil, aggregates and cement trains. 66 608, 66 609, 66 611, 66 612, 66 624 and 66 625 have been exported to Poland, the operating subsidiary Freightliner PL.

66/7	88	66 701-733 66 735-789	GB Railfreight	Operates on coal, intermodal services and also engineering / departmental work for Transport for London and Network Rail on London Underground and National Rail lines.

66/8	5	66 846-850	Colas Rail	Former operated by Freightliner as 66 573-577.

66/9	7	66 951-957	Freightliner	A lower emission variant – fuel capacity reduced to compensate for the increased weight of other components.

Sentence(s)

In 2011, Freightliner took on Direct Rail Services' 66 411-420.

final_sentence: In 2011, Freightliner took on Direct Rail Services' 66 411-420.