The Invention of the Track Circuit / The history of Dr. William Robinson's invention of the track circuit, the fundamental unit which made possible our present automatic block signaling and interlocking systems

by American Railway Association

THE INVENTION
OF THE
TRACK CIRCUIT

THE HISTORY OF
DR. WILLIAM ROBINSON'S INVENTION
OF THE TRACK CIRCUIT

THE FUNDAMENTAL UNIT WHICH MADE
POSSIBLE OUR PRESENT AUTOMATIC
BLOCK SIGNALING AND INTERLOCKING
SYSTEMS

SIGNAL SECTION
AMERICAN RAILWAY ASSOCIATION
NEW YORK 1922

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