The ship was propelled by a triple expansion steam engine 39 inches ( 99 cm ) and 70 inches ( 180 cm ) diameter by 48 inches ( 120 cm ) stroke .
A triple expansion steam engine had cylinders of 24.5 inches ( 62 cm ) .
The ship was propelled by a triple expansion steam engine , which had cylinders of 24.5 inches ( 62 cm ) , 39 inches ( 99 cm ) and 70 inches ( 180 cm ) diameter by 48 inches ( 120 cm ) stroke .