Translations:How to operate relay line block equipment/56/en

The systems automatically detect train movements with the help of track circuits or axle counters and thus determine whether the individual block sections are free. In addition, it is possible to set up automatic block signals along the line in order to increase the train density, which is the norm in Poland. But there are also automatic block lines without automatic block signals. The technology to control the SBL-Signals is usually located in a separate container next to the signals. SBL-Signals show "clear" as default position.