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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