You guys have a knack for digging up old photos and movies of cool and odd contraptions that have ridden the rails over the decades. There seems to be no end to imagination of putting anything on the track. Where there is a need we see railtrucks, rail cars, velocipedes and other various pedal and motor driven contraptions and means of conveyance.
One has been missed and it was used on one of my favorite RR’s the Mount Washington Cog Railway.
Gentlemen I give you the “Devils Shingle”
It was a crude wood sled which the worker would sit on and with nothing but gravity and courage he would slide down the mountain.
http://www.cog-railway.com/devils.htm
Crazy stuff