Curved Overlap

On curved tracks the overlap wires have to maintain that all-important contact with the pantograph. Like plain curved track the contact wire has to be on the outside of the curve at the registration point, therefore curved overlap has special mast.

At Prestonpans on the ECML in Scotland a special arrangement is used as the wires are supported on twin track cantilevers, this involves six mast for the overlap as all the balance weights are on the outside of the curve.