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Over the years there have been many different schemes and ideas to accuate crossing gates, many of them in the early years of the railroad and not working! Before the advent of electrically actuated gate out in the country there would often be only a crossbuck whereas in towns there would be a centrally located crossing tower or shanty with a man stationed there to manually operate the gates by levers upon the approach of a train. The most currently used system uses the electical resistance from one rail through the train to the other rail to detect a train and through simple timing lower the gates. With the advent of today's electronics sometimes optical sensors are used and the most modern systems actually measure a trains speed to lower the gates at the most opportune time for the motorist's safety without holding them up too long.
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