Randy, IRT your question re my catenary, I "kitbashed" it using using the older style Marklin catenary wire, basswood uprights, thin brass crosspieces and insulators custom cast for me by a friend. So I don't really have a "how to do" guide. Here is another view that shows a bit more of the catenary construction. That's ACL's eb "Southland" at Mid-Grade. I had to "jack" all the MTH signal bridges up to clear the wire.
My goal was to make a "generic" catenary that would work for multiple railroads. And when running railroads (like the NKP 1948-54 which I'm running now) that would never have run under catenary...well...it's my railroad.
The dealer I bought the Marklin catenary from said the European modelers that patronized his store (since closed, sadly) derided the catenary as "too thick" for HO. Now that I have built a European HO layout (mostly Roco) and got proper scale catenary from a hobby shop in Dortmund, Germany, I understand their complaint. The correct scale HO catenary wire is very thin...and very fragile.
But for O Scale purposes, the much maligned older style Marklin catenary wire works fine.
Because I run a number of railroads in six different time periods on CONUS Lines (my operational concept) I have a number of electrics from various roads: NH, PRR, VGN, GN, MR. I initially shied away from installing catenary but when my late wife said "it just doesn't look right" I took the plunge. In that the layout is 24 x 35 ft with two 7 x 14 ft peninsulas the catenary insulation, after several "proof of concept" failures, took almost a year to install.
The LHS owner (now deceased) wondered "what do you need all this basswood for?" When done I invited him to view the final product. Now he understood!