DS-P21 Overhead Wires Registration Over Track 1989
SHEET P21 - OVERHEAD WIRES, REGISTRATION OVER TRACK, c.1989
This sheet documents the way that the overhead wires are located relative to the track,
referred to as the wiring registration. The contact wire zig-zags across a 2’6” region along the centreline of the track, or the centreline projected by the superelevation on curved track, at the height of the contact. This spreads wear upon the contact surface of
pantographs equally across their width.
The result of this is that at some masts the contact and catenary pull away from the mast, referred to as a positive radial load upon the mast, while at the intermediate masts the contact and catenary pull toward the mast, referred to as a negative radial load. This is shown diagrammatically on the sheet for curved and straight (tangent) track and at a
simple turnout.
Individual drawings of masts detail their configurations for positive and negative radial
loads, and on curves. Further details explain the arrangement of the contact, catenary, pull-off mast, and fixed anchor termination mast that occur at a turnout.
This sheet also includes a glossary of the terms used by the NSWGR and on these sheets for the components used for overhead wiring.