Rationale for railway signalling

Railway Signalling. Main Functions

Figure 2 - Rattrapage (© Gilbert Moëns/Jacques Poré)

Figure 3 - Nose to nose (© Gilbert Moëns/Jacques Poré)

Figure 4 - Wrap (© Gilbert Moëns/Jacques Poré)

Figure 5 - Derailment due to speeding (© Gilbert Moëns/Jacques Poré)

Figure 6 - Derailment (© Gilbert Moëns/Jacques Poré)

Figure 7 - Risk of collisions (e.g. at level crossings) (© Gilbert Moëns/Jacques Poré)

Figure 8 - Control and monitoring of turnouts (© Gilbert Moëns/Jacques Poré)

Figure 9 - Signalling systems associated with a switch to operate, lock and control it (© Jacques Poré)

Figure 10 - Circuit de Voie (CdV) principle (© Gilbert Moëns/Jacques Poré)

Figure 11 - Principle of electric joint track circuits (© Gilbert Moëns/Jacques Poré)

Figure 12 - Principle of the Axle Counter (© Gilbert Moëns/Jacques Poré)

Figure 13 - Electromechanical sensors (© SNCF IGSF)

Figure 14 - Electronic pedal (© Gilbert Moëns)

Figure 15 - Signal showing &#34;carré&#34; indication (© Gilbert Moëns)

Figure 16 - Absolute stop marker (Nf) (© Collection Gilbert Moëns)

Figure 17 - Indication 270 Announcement in the driver&#039;s cab (© Jacques Poré)

Figure 18 - Principle of the Block Automatique Lumineux (BAL) (© Gilbert Moëns/Jacques Poré)

Figure 19 - Principle of the Block Automatique à Permissivité Restreinte (BAPR) (© Gilbert Moëns/Jacques Poré)

Figure 20 - Different types of interlocking system (© Gilbert Moëns/Jacques Poré)

Figure 21 - Interlocking routes in opposite directions (© Gilbert Moëns/Jacques Poré)

Figure 22 - Level crossing with automatic light signal (PN SAL 2) (© Jacques Poré)