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.
Lantern Forge is a sandbox action RPG game, featuring a massive randomly generated world. Craft a variety of tools to gather dozens of resources to shape the world as you see fit. Featuring beautiful isometric-perspective art and skills-based combat.