Boilers accumulate sediment very quickly. Every 31 days, the steam locomotive must be shut down, the boiler drained, and all sediment and scale washed out. This is done in the Roundhouse at Steamtown NHS.
Part of the mystique of steam locomotives is that the moving parts are visible. The air pump supplies compressed air for the brake system. The rods connect the piston with the wheels and the wheels with the valve timing gear. All of this is visible when a steam locomotive moves.
The builder's plate of a steam locomotive tells when, where and by whom the engine was built. Canadian Pacific 2317 is a little different. The boiler on the engine is not the original one; it was replace in the early 1930s with on fabricated in the Canadian Pacific Railway shops in Winnipeg.