It reads 100 psi. The engine is at rest. Operating pressure is 150 psi. Pressures higher than that will result in "popping the safety's" The safety valves are the most important valves on a steam engine. They release the pressure in the boiler when it gets to high, without them the boiler becomes a bomb.

Photographed by Rich Currie, November 3, 2006.
Added to the photo archive by Rich Currie, November 12, 2006.
Railroad: Mt. Washington Cog Railway.

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