Oh alright. Considering how long this topic has been on-off-on here, I guess I'm not that late to the party.
All of the PRR corridor poles I've installed on the module set have been scratchbuilt. K&S/Special Shapes make decently sized brass H column and round rod for N scale. Miniatronics offers a nice etched-brass latticework light pole for HO, which is perfect for N scale corridor poles. For Arm and Beam-span type poles, HO code 100 rail works beautifully for the primary beam, with code 70 for the angled struts. For wire-span type poles, just use .010 or .015 steel music wire.
As I'm going to be building several new sets of poles for the 58th Street module pair (and eventually for the Holly/Hook flyover along I495 in DE), I might be willing to produce a few more while I'm at it. How many do you need, and of what flavors? Round, H, lattice? Beam, Wire, or Arm? Over how many tracks each? If certain versions are popular, I might make up some jigs for building them repeatably.
For the wire itself, I build it in set lengths typical of PRR pole spacing, and simply solder the ends with a slight lap at each pole. Pantographs are quite forgiving, and I've made it work with little issue.
--Drew