All About Signals

Plot

Originally published as a series of article in "Trains" magazine, this booklet describes the history of modern railroad signals: how early signaling developed, how manual block system and automatic block systems work, multiple aspect signaling, signal aspects, indications and types, automatic train control, cab signaling, coded control, mechanical interlocking, automatic interlocking, and Centralized Traffic Control. Illustrated throughout with black and white photos and numerous diagrams. 26 pages.