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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.
The final, and most common practice is for the bell to begin ringing when the lights begin flashing and stops when the gates begin to go up following the passing of the train. [citation needed] Some level crossings that are located close to intersections with traffic lights program the signals with a preemption sequence so when the approaching ...
Other names include railway level crossing, [1] railway crossing (chiefly international), grade crossing or railroad crossing (chiefly American), [2] road through railroad, criss-cross, train crossing, and RXR (abbreviated). There are more than 100,000 level crossings in Europe and more than 200,000 in North America.
A signal used in the Delhi metro, typical of urban light rail signals. Usually, signals and other equipment (such as track circuits and level crossing equipment), are powered from a low voltage supply. The specific voltage varies with the country and equipment used.
In contrast to the American "railroad crossing", Australian signs say "railway crossing" or "tramway crossing". (Most cases where a tram in its own right-of-way crosses a road do not use a crossbuck and so are regular intersections rather than level crossings.) Different countries may classify the sign differently.
Normally, level crossing warning signals display no aspect (i.e. are unlit). They light up in the front of an approaching train which is the first clue that the system is working correctly. Level crossing warning signals are unrelated to other signals, therefore in case of Osp1 signal a train must proceed at 20 km/h regardless the higher speed ...
The RTC can also issue special permissions to trains via radio. In order to pass signals set at stop (Rule 564), reverse direction within a block (Rule 577) or enter the main line at a manual switch not equipped with a signal (Rule 568), the train crew must copy the RTC's instructions and repeat them back correctly before being allowed to proceed.
Auxiliary signals are used to send permission to pass a signal which has failed or is showing the 'stop' aspect. This avoids the use of formal orders which would delay trains too much. An auxiliary signal allows the driver to proceed at sight without needing communication between the driver and the traffic controller.