Belgian railway signalling
For this they are equipped with lenses to focus light rays emitted by the bulb, which can be selected and reasonable power.
A white number below the main aspect restricts the speed (from the first switch or track junction after the signal).
Above the main aspect, the signal can show a chevron (to change the regime), or a "U" (when the train is led towards a dead end).
The Completed operations indicator is a system composed of a set of switches (activation) and light signals (display) on platforms of most stations and allows the guard to announce to the driver (conductor) that the procedure for boarding is completed and the train can start.
Other signals complement the fixed signs: The TBL1+ system was designed in 2006 by the Belgian subsidiary of the Alstom Transport group.
The trigger for developing this system was the Pécrot disaster in March 2001 when two trains collided head-on because a driver had passed a red signal, drawing attention to the fact that on the majority of lines, no system prevented the train from passing a stop signal.
At the time, however, the existing TBL1 system offered this feature of automatic stop at red lights, but only a few main lines were equipped (or approximately 13% of signals).
When the train passes a signal as the TBL1+ system simply repeats information and makes a short sound in his cab (the lamps used to indicate a possible restriction are also extinct).
In addition, a yellow lamp is lit in the cabin to remind the driver that runs under a restrictive regime.
This type of aspect (typically a red signal) instructs the driver to halt and can not be passed by a train (except with a special procedure).
In this mode, indicated by the "V <40" LED display, the train speed can not exceed 40 km/h (25 mph), otherwise the emergency brake is applied.
Therefore, it is quite possible to migrate a line equipped TBL1+ to ERTMS, or even superimpose the two systems without having to change the ground beacons.
When a line is not equipped with TBL1+ beacons, the system uses information provided by crocodiles on the ground, under the limits of MEMOR functionality.
The onboard computer is connected to an antenna to read ERTMS tags placed in the path, and a brush-crocodile to capture the information transmitted by crocodiles in the track.
