The emphasis now is on replacing Amtrak’s outdated overhead wires, or catenary, which droops in the heat and can become tangled with the pantographs that deliver power from the wires to the train.

NJ Transit trains were also scrutinized for defects in their pantographs, the roof-mounted power collection hardware, which were blamed for bringing down aging wires in some instances ...

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The old wires sag during extreme temperatures, causing them to fall on the tracks or tangle with pantographs, the equipment on top of the trains that touch the overhead wires and distribute power ...