What specific operational context meant the Allegheny often utilized its massive boiler and firebox below its designed potential?
Answer
It was relegated to hauling coal drags of 10,000 tons or more at only 15 mph.
The C&O primarily used the H-8s for slow, heavy coal drag service, which meant the huge boiler, designed for high-speed work, was churning out more steam volume than the cylinders could efficiently use at those reduced speeds.
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