Fabyan House was constructed by Sylvester Marsh who also built a railway which is technically what?
Fabyan House: Fabyan House was a grand hotel in the White Mountains of New Hampshire, constructed by Sylvester Marsh who also built the Mount Washington Cog Railway. Mount Washington Cog Railway: The Mount Washington Cog Railway is the world's first mountain-climbing cog railway (rack-and-pinion railway). Mount Washington Cog Railway:  Its track is built to gauge, which is technically a narrow gauge, as it is a ⁄ -inch (12.7 mm) less than .
narrow gauge