A Cyclops is a creature with one-eye from Greek Mythology.
How It's Used
"The minute you entered a yard, the bigness of the trains translated right into your bones. It sounds corny, but you got proxy thrills of power. Boxcars as wide as whales, locomotives roaming up and down the yard with the single white eye of a cyclops, grain hoppers overflowing with corn and wheat, gondolas piled with scrap metal and flatbeds loaded with raw logs or finished lumber, triple-deckers packed with import cars, empty deadheads and old rusting crummies shunted onto sidings."
—Charles D'Ambrosio, “Train in Vain,” The New Yorker, 14 Jun 04.