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.
Transportation History: The Steam Locomotive. Steam power is one of the most important and key aspects of the Industrial Revolution. The invention of the steam engine created many changes and additions to the technology of the time, including steam powered locomotives. Steam locomotives are vehicles that run on rails or tracks and are powered by steam engines. They were historically used for moving freight and other materials, as well as passengers.