TY  - BOOK
AU  - Association,American Railway
TI  - 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
PY  - 2014///
PB  - Project Gutenberg
N1  - Public domain in the USA; Electronic text
UR  - http://www.gutenberg.org/ebooks/45179
ER  -