Excellent series of 844 maintenance photos!
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An only UP/Alco design, dual stacks are so much better for exhaust output, this engine by far is the most technologically advanced U.S steam locomotive currently in operation.
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What is the advantage of dual stacks? Each cylinder's exhaust is targeted at a different stack I take it. Does this have an advantage in creating draft? Does combining the exhaust from both cylinders in other steam locomotives have negative effects somehow? I'm curious to know.
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