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.
Internal combustion engine: An engine, like a car engine, that burns fuel inside it. Locomotive: type of train engine. Coal: a soft, black rock made from fossilized plants that burns easily. Blocks or cylinders which are pushed down by the steam in a steam engine.