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Level crossing signals are electronic warning devices for road vehicles at railroad level crossings. Level crossings can be operated in various ways. In some countries such as the UK, the warning devices are more often than not activated by remote control, I.e. an operator pressing buttons. However, the majority of countries have automated systems.
Chinese crossings have two red lights and at most crossings, a white light that remains lit when the crossing is clear. Level crossings in China use alarms rather than bells. Speed up campaigns have largely eliminated many crossings on heavily used trunk main lines though some still do exist.
A level crossing is an intersection where a railway line crosses a road, path, or (in rare situations) airport runway, at the same level, [1] as opposed to the railway line or the road etc. crossing over or under using an overpass or tunnel.
Network Rail is pursuing a policy of closing level crossings at the rate of over 100 a year in the interests of safety, and replacing them with road bridges or footbridges. [22] The number of level crossings on rail lines controlled by Network Rail went from 7,937 in 2003–04 [23] to 6,322 in 2013–14, [24] and 5,887 by 2016–17. [25]
The interlocking tower and tracks in Des Plaines, Illinois Any location that includes a switch or crossing of two tracks, derived from the early practice of installation of a system of mechanical equipment called an interlocking plant to prevent collisions. See also signal box. Interlocking is also the term for the actual mechanical or ...
On the approach to a movable item of infrastructure, such as points or switches or a swingbridge; In advance of other signals; On the approach to a level crossing; At a switch or turnout; Ahead of platforms or other places that trains are likely to be stopped; At train order stations 'Running lines' are usually continuously signalled.
Instead, a 3 V circuit from a switch in the signal box operated a relay in the battery box. When the signal was at 'caution' or 'danger', the ramp battery was disconnected and so could not replace the locomotive's battery current: the brake valve solenoid would then be released causing air to be admitted to the vacuum train pipe via a siren ...
An electro-mechanical treadle. In railway signalling, a treadle is a mechanical or electrical device that detects that a train wheel has passed a particular location. They are used where a track circuit requires reinforcing with additional information about a train's location, such as around an automatic level crossing, or in an annunciator circuit, which sounds a warning that a train has ...