These three cylinder Pacifics, although capable of hauling heavy loads at high speed, had in practice proved to be relatively maintenance-intensive, particularly with regard to the servicing of the valve gear and motion for their third (inside cylinder).
These three cylinder Pacifics had in practice proved to be relatively maintenance-intensive to the servicing of the valve gear and motion for their third (inside cylinder). This was particularly with regard. This was although capable of hauling heavy loads at high speed.