While most of us are limited to the visible spectrum, people with a condition called aphakia possess ultraviolet vision. Aphakia is the lack of a lens, due to surgical removal for cataracts or congenital defects.
A railroad lantern and a railroad lamp are two different things. Lanterns were designed to be portable (i.e. carried) and were basically globes surrounded by a metal frame with a fuel source. When you think of a railroad worker swinging a signal, think lantern.
Depot, train car lanterns & lamps: The railroad also used a variety of lanterns and lamps in the railroad depots/stations, and in the railcars (passenger and caboose). Unfortunately, I don't know a thing about them.