 Both the A2/2 and the subsequent A2/3 suffered badly from frame movement, vibration and loose fittings.Using equal length connecting rods, as well as the divided drive meant that the centre cylinder was much further forward than the outside cylinders.During their lifetime in service "Earl Marischal" was the only A2/2 to cover over one million miles, 360,907 as a P2 and 673,947 as an A2/2.