Peter Kerslake adds "In an effort to find suitable work for Old Oak Common's Kings in the face of increased dieselisation six including 6003 King George IV were sent to Cardiff Canton September 1960 followed by two more twelve months later. Although Canton's Castles were the mainstay of the principal express passenger duties the eight Kings permitted the use of up to fourteen coaches and 6003 certainly has an impressive load on the 'Red Dragon'.