I talked to one of the men who was very knowledgeable about these steam engines. I can't say I took a lot away from the conversation, because--as much as I wanted to understand how it all worked--it looked like a big mess of pipes and steam fittings, most of which appeared to be leaking very hot water.
Here are some things i remember:
The whole business can explode under certain conditions. It is not for lack of maintenance, usually--but because the water level was allowed to get too low, resulting in a "dry fire" situation. Then, if water is added when the boiler is super-heated, the relief valve can't act quickly enough to get rid of the sudden build-up of steam. Result: Explosion.
To reverse the tractor, the engine itself is reversed. How this is done will forever remain a mystery to me.
The operating pressure (monitored by a big pressure gauge), is usually between 75-100 psi.
There are different governors that act on different parts of the whole operation. Someone here probably knows what they do.
One of the big traction engines I rode had rubber attached to the steel wheels because they drove it from the next town over--about ten or fifteen miles. Rubber looked to come from treads from truck and tractor tires.
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