Translations:How to operate relay line block equipment/13/en

If all these requirements are met, the main signal can be set to clear in the direction of the neighbouring signal box. As soon as the main signal shows "clear", the line repetition interlock becomes effective (Polish: przekaźnika przeciwwtórności liniowej). It prevents two trains in a row from entering the same block section without having the line bock being properly operated in the meantime.

ATTENTION: If the signal is brought back to stop before a train has passed, the line repetition interlock remains active (red). The main signal cannot be set to clear again until a train passed the block section under regular operation of line block equipment. If the train passes the signal showing "clear", it is time to give "the train in section" signal and thus report the line as occupied. The following technical requirements must be met for operating the starter field (Po):