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Re: PE overhead contact system
Author: Dr Zarkoff
Date: 04-13-2011 - 18:17
Rather than catenary, the four tracks in the pic have what could be termed "compound span wire constrcution", that is, a second span wire above the first to support the wires over the center tracks. The wire on the track nearest the tower doesn't end, it follows the track which takes off to the left (there's an unused trolley wire hanger on the span just this side of the switch).
Compound catenary uses a messenger which supports a secondary messenger, which in turn supports the contact wire. The Sydney, NSW, suburban system uses catenary which has one messenger and two contact wires side by side. Each hanger connects to one contact wire, goes over the messenger, and then connects to the other contact wire, holding them both on the same plane. Each pole has steadys which hold the two contact wires about 2" apart.
Compound catenary uses a messenger which supports a secondary messenger, which in turn supports the contact wire. The Sydney, NSW, suburban system uses catenary which has one messenger and two contact wires side by side. Each hanger connects to one contact wire, goes over the messenger, and then connects to the other contact wire, holding them both on the same plane. Each pole has steadys which hold the two contact wires about 2" apart.
