| Author: | American Railway Association |
| Subject: | TF, Railroads -- Signaling -- Block system, Robinson, William, 1840-1921 |
| Format: | Text |
| Date issued: | 2014 |
| Language: | English |
| Publisher: | Project Gutenberg, |
| Rights: | Public domain in the USA. |
| Download link: | 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 [electronic resource] / American Railway Association |