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At certain locations along the overhead line system, equipment known as "section
insulators" are installed to segregate the different power supply zones. It
is common that there may be slight electrical potential difference between two power
supply zones. Thus, when a pantograph of a train is traversing across a section
insulator, it will bridge the two different power supply zones that may be at different
electrical potentials and result in a flash at the overhead line. This kind of flash
is normal and will not hamper railway safety.
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