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B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
B61L29/00—Safety means for rail/road crossing traffic
B61L29/24—Means for warning road traffic that a gate is closed or closing, or that rail traffic is approaching, e.g. for visible or audible warning
B61L29/28—Means for warning road traffic that a gate is closed or closing, or that rail traffic is approaching, e.g. for visible or audible warning electrically operated
B61L29/30—Supervision, e.g. monitoring arrangements
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FR389710D1907-04-291908-04-29Dispositif pour empecher les accidents de chemin de fer aux passages à niveau
ExpiredFR389710A
(fr)