Translations:How to operate relay line block equipment/20/en
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The permission field is set up when a track is used in both directions as scheduled. This is the case for single-track lines and for double-track lines equipped with main signals in both directions. In second case, the instructions for the operation of "NO" and "NP" as described for SBL systems (see below) apply in analogy, in case movements take place on the opposite track.