[Pelham]

“That is also why steam locomotives needed to constantly refill with water, as they only used the steam once, and the water was lost to atmosphere.”

Except for the magnificent Mallet locomotives with their high pressure cylinders in back and low pressure cylinders in front. The N&W Y6b being one of my favorites.

[Don W]

Yes, the double expansion did get more use from the energy in the steam/water, but then the water was lost after the low pressure expansion. A condenser would be far and away too large a weight penalty, as it could only use atmosphere to cool, and the fans would use all the energy produced to condense the still hot low pressure steam.

[Mycroft Holmes]

Thanks for an "in the weeds" discussion of the characteristics of steam engines. There is a contingent out here that loves that sort of stuff. Carry on.

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