 The Britannias took their names from great Britons , former Star Class locomotives , and Scottish firths . The class remained in service until the last was withdrawn in 1968 . Two survived into preservation , the first @-@ of @-@ class , number 70000 Britannia , and 70013 Oliver Cromwell . Number 70000 has hauled mainline excursions and 70013 , after a period of display following limited steaming , returned to mainline steam in 2008 for the first time since leaving British Railways ownership . 70000 was returned to the main line in 2011 . 
