by Allen Hazen
The paragraph accompanying the photo of experimental 4-8-4 #800, class HS-1a, says the boiler produced steam at 800 lbs/sq.in and 25 lbs/sq.in. I take it these are the pressures of steam produced for use in the pistons: did it also have an extremely high pressure (ca. 1400 lbs/sq.in) closed cycle internal portion of the boiler, as did Cnadian Pacific's experimental 2-10-4? (Question also posted to Steam Locomotives forum.)
