Translations:How to operate relay line block equipment/21/en

The permission field is also connected to the according permission field of the neighbouring interlocking. If it is blocked (red), the neighbouring signal box may release a train. If the permission field is unblocked (white), we are allowed to release a train. If the permission field is blocked, the exit signals in the direction of the track are held in stop position. Only one signal box can have the permission for one track at a time. The permission field can only be operated when all other block fields are unblocked (white) and line repetition interlock is not in effect.