Bronze stuffing glands are fitted to the stainless steel piston and valve rods. All cylinder covers and valve chests are fitted with gaskets and are screwed together. Valve-gear components are constructed from steel and bronze. Lubrication of the cylinders is by the displacement method - steam is condensed and oil is forced into the cylinders. The lubricator is housed either in the cab or at the front of the locomotive.
Boilers are of copper construction and fully brazed and silver soldered.
All boilers are fitted with a steam regulator to control the power and speed of steam to the cylinders. Superheaters are fitted to all locomotives, this economises the use of steam before reaching the cylinders. The safety valve is usually of the 'pop' type at 75 psi. Superstructure is constructed from a composition of brass, copper, aluminium and steel, screwed, rivetted and soldered together. Chimneys, domes and other details are turned from brass.