Switch or electrically controlled switch, constituting an elementary logic device for the construction of central equipment or other railwayNetwoprk. Common and varied use term, indicates railway syst... signalingSet of signals, instruments and standards necessary to regul... systems, with electromechanical tecCombined European transport. Freight trains reserved for int...hnology. In safetyIn safe systems, it indicates the characteristic of a system... applications relays with particular characteristics and construction standards are used. See individual items
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