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The AT&SF Hudsons had extendable or telescoping exhaust stacks which I believe were operated off of compressed air.  Apparently this was a way to better lift the exhaust smoke higher off the boiler.  The Santa Fe used these appliances on many of their mainline steam locomotives.  I am not sure if the MTH one is operable or stationary.  Some O scale models give the user a separate extended stack to exchange with the lowered version. 

Allegheny48 posted:

The AT&SF Hudsons had extendable or telescoping exhaust stacks which I believe were operated off of compressed air.  Apparently this was a way to better lift the exhaust smoke higher off the boiler.  The Santa Fe used these appliances on many of their mainline steam locomotives.  I am not sure if the MTH one is operable or stationary.  Some O scale models give the user a separate extended stack to exchange with the lowered version. 

See my picture above. It for sure works, and stays up when you put it in the upright position. I run mine with the stack extension up all the time. 

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