Arcing flashes happen when the arm that extends from the train, called the pantograph, loses contact with the power cable above, or the catenary. That loss of contact is what causes the loud bang and the sparks, and causes the trains to lose power.
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She said: This is normal on a frosty morning, be it on a tram or train. When you put the tram onto the overhead wire, because you have electricity connecting with a very cold wire, it creates a spark.
Conventional electric trams are operated in street running and on reserved track for most of their route. However, on one steep segment of track, they are assisted by cable tractors, which push the trams uphill and act as brakes for the downhill run.
And the main reason for that is safety. Locomotive engineers are required to honk every now and then, which is written down in the regulations called the Final Rule on the Use of Locomotive Horns.
On a road where trams operate, which vehicles are most at risk from the tram rails? Explanation: The wheels of a bicycle can become stuck in tram rails, causing the cyclist to stop suddenly, wobble or fall off. Tram rails also offer less grip than the road surface.