The rebuilding with superheaters was accompanied by a reduction in boiler pressure and an increase in cylinder diameter.

The name referred to the car's fiscal horsepower, which was a function of the cylinder diameter.

"17in" refers to their cylinder diameter in inches.

This was closely followed by two other locomotives which also incorporated variations in the cylinder diameter and superheater size for comparative purposes.

The three machines built in 1906 had their cylinder diameter increased from 285 to 305 mm.

The cylinder diameter was reduced from 570 mm on the D50s to 550 mm to minimize wheel spin.

Displacement volume, which was calculated from the cylinder diameter, stroke and number of cylinders being the dimensions that determined the power for road taxation purposes.

The three classes differed only in cylinder diameter and thus tractive effort, each subsequent class increasing that measurement by an inch.

Water ports must be connected to the removable head and there is little space available within the cylinder diameter.

The valves were considered undersized for the large cylinder diameter and this somewhat limited the speed capabilities of the engine.