Why do all trolleys have two poles?
Obviously they need two contact wires, and separate leads for the incoming and return current, because the wheels are insulated rubber ones on nonconductive pavement, and return current cannot be sent to iron rails.
But just what prevents the use of a single trolley pole containing two leads insulated from one another, ending with a forked ending to the two wires? The distance between the two wires is fixed, the size of the branched ending can be fitted to this.
Any problems here?
Obviously they need two contact wires, and separate leads for the incoming and return current, because the wheels are insulated rubber ones on nonconductive pavement, and return current cannot be sent to iron rails.
But just what prevents the use of a single trolley pole containing two leads insulated from one another, ending with a forked ending to the two wires? The distance between the two wires is fixed, the size of the branched ending can be fitted to this.
Any problems here?