There is a chain set into the groove of this vertical sheave. This is the pit sheave. The chain is connected to weights that rise and fall. Engine House No. 6 is listed on the National Register of Historic Places, as part of the Allegheny Portage Railroad National Historic Site.Galleries:Allegheny Portage Railroad, MachineryKeywords:allegheny portage railroad, chain, counterweights, engine, engine house, gallitzin, pennsylvania, pit sheave, sheave, steam-powered engine, vertical sheavePhoto Location: Allegheny Portage Railroad National Historic Site, PennsylvaniaPhotographer: Dr. Roy WinkelmanDate of Photo: 11/25/2011Device Make: CanonDevice Model: Canon EOS 5D Mark IIOriginal Dimensions: 5526×3582Picture Orientation: LandscapeGPS Coordinates: 40°27'22.18"N 78°33'01.88"WPicture Number: 15805
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