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.
Steamtown hosted visiting steam locomotives during the Grand Opening in 1995. Five steam locomotives were posed in the Roundhouse for this photo. Historically, steam locomotives faced the other way in the Roundhouse to allow more room between the locomotives at the end where the work was done.
One of the special features of Steamtown is that visitors can get an up-close experience with 450,000 pound steam locomotives. Here, the Canadian National 3254 rolls past visitors as it exits the Roundhouse.