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Add Commonwealth bogie
;CNC:Computer Numerical Control. A computer converts the design produced by Computer Aided Design software into numbers which are used to control the movement of the cutter.
;Collett:Charles Benjamin Collett, Chief Mechanical Engineer (CME) of the Great Western Railway 1922-1941
;Commonwealth bogie
;Commonwealth bogies:BR's standard carriage bogie from 1955 to 1963, originally designed by the Commonwealth Steel Company (US) and manufactured under licence in the UK. A heavyweight cast steel bogie incorporating sealed roller bearings and coiled suspension to give a superior ride quality and a speed rating of 100mph.
;Composite:Carriage having more than one class of seating, ie First and Third or latterly First and Standard.
;Conflat:GWR telegraphic code signifying a flat wagon for containers
