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"Quote":"Y6b was not meant to deliver useful work at speeds in excess of 40 mph"And is not it just the reason, the N&W had in addition the Class A, too?@clash: I guess the Coal from Hanna and Rock Springs (Food for the BB) is lower qualitiy and would not burn so efficient. Ok, don't have a qualified source for that, but I read once that the coal in BB's firebox would never touch the grate, 'cause burned so quickly. A deeper firebox, feeded with suitable coal, may spread and keep the heat better... However, the y6 keeped its firebox above the rear drivers, same BB. Maybe the Y6 would do better with low grade coal than an "A" ? But how much relevant is an 10% -20% difference between the heat content related to hp? 200-300hp?lars
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