Original sentence: A metal pole may use such a cable, or may itself be electrically "live," requiring the base to be insulated from the vehicle body.However, pushing of the pole (termed "back-poling" in the US or "spear-poling" in Australia, was quite common where the trams were moving at slow speeds, such as at delta (or wye) terminals and whilst backing into the sheds.In the United States, the dual-pole system was the most common arrangement on double end vehicles.On systems with double ended railway cars capable of running in both directions, the trolley pole must always be pulled behind the car and not pushed, or dewiring is very likely, and it can also cause damage to the overhead wires.The trolley pole sits atop a sprung base on the roof of the trolley vehicle, the springs maintaining the tension to keep the trolley wheel or shoe in contact with the wire
Edited sentence: A metal pole may use such a cable, or may itself be electrically "live", requiring the base to be insulated from the vehicle body.A trolley pole is not "attached" to the overhead wire.However, pushing of the pole (termed "back-poling" in the US or "spear-poling" in Australia), was quite common where the trams were moving at slow speeds, such as at wye terminals (also known as reversers) and whilst backing into the sheds.In the United States, the dual-pole system was the most common arrangement on double-ended vehicles.On systems with double-ended railway cars capable of running in both directions, the trolley pole must always be pulled behind the car and not pushed, or dewiring is very likely, and it can also cause damage to the overhead wires.The pole sits atop a sprung base on the roof of the trolley vehicle, the springs maintaining the tension to keep the trolley wheel or shoe in contact with the wire