"Killingworth locomotive" . "Killingworth locomotives" . "Killingworth Colliery locomotives" . "Bl\u00FCcher" . "previous designs" . "Killingworth locomotives" . "''Bl\u00FCcher''" . . "Killingworth" . "several others" . . "his locomotives" . . . "1814" . . "earlier locomotive" . . "a locomotive" . "1814" . . . . "Killingworth locomotives#Killingworth Billy" .