One of the earliest forms of fixed railway signal is the semaphore. These signals display their different indications to train drivers by changing the angle of inclination of a pivoted 'arm'.
Token • Train order operation • Centralized traffic control • Chinese Train Control System • Transmission Voie-Machine • European Train Control System • Radio Electronic Token Block • Automatic Block Signalling • Positive Train Control • Communication-based train control
Signalling control
Integrated Electronic Control Centre • Interlocking • Lever frame • Solid State Interlocking • Westlock Interlocking
Application of railway signals • Railway semaphore signal • Cab signalling • British railway signals • North American railroad signals
Train detection
Axle counter • Track circuit • Treadle
Train protection
Automatic Train Control • Automatic Train Protection • Automatic Warning System • Automatische treinbeïnvloeding • Balise • Continuous Automatic Warning System • Contrôle de vitesse par balises • EBICAB • Integra-Signum • Le Crocodile • Linienzugbeeinflussung • Pulse code cab signaling • Punktförmige Zugbeeinflussung • RS4 Codici • Sistema Controllo Marcia Treno • Slide fence • Train Automatic Stopping Controller • Train Protection & Warning System • Train stop
Organisations
AAR • AREMA • FRA • HMRI • IRSE • Transport Canada • UIC
By country
Australia • Belgium • Canada • Finland • France • Germany • Greece • Italy • Japan • Netherlands • North America • Norway • Sweden • Switzerland • United Kingdom