Automatic block signals and signal circuits
American practice
Ralph Scott 1908
Preface Contents Index
Preliminary considerations
Simple circuits
Normal danger circuits
Normal clear circuits
Semi-automatic circuits
Batteries
The track circuit
Controlled manual systems
Motors, relays etc
Hall apparatus
Union apparatus
Electro-pneumatic and electro-gas systems
Electric locking
All-electric interlocking
Three-position signals
Electric railway systems
Maintenance
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Sidan uppdaterad den 25 juli 2023