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Publication of FR643734ApublicationCriticalpatent/FR643734A/fr
B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
B61L29/00—Safety means for rail/road crossing traffic
B61L29/08—Operation of gates; Combined operation of gates and signals
B61L29/18—Operation by approaching rail vehicle or train
B61L29/22—Operation by approaching rail vehicle or train electrically
B61L29/226—Operation by approaching rail vehicle or train electrically using track-circuits, closed or short-circuited by train or using isolated rail-sections
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FR643734D1927-11-101927-11-10Perfectionnements dans les passages à niveau des voies ferrées
ExpiredFR643734A
(fr)