Union Pacific Big Boy Locomotive
It must be a bit like that PIPES screen-saver in windows LOL I would bet that's where Bill Gates got the idea from
WT Jones wrote:
Steam was used to power nearly every function of the locomotive, injector for boiler water, coal stoker for the firebox, electrical generator etc.. every one of those valves had a function. Instead of switches you find in today's machines, they used valves.