This bridge is on the line across the Furka pass, which was disused two decades ago when a tunnel opened, but later rebuilt for museum trains.
This area is covered in deep snow in winter, for that reason the railway traffic ended and surface elements were dismantled every autumn and rebuilt every spring. This bridge (which is as steep as it appears!) is foldable: see picture below!
*Lunatic*, n. One whose delusions are out of fashion.
