You asked about catenary. I have no documentation but I has made a few photos for you of the most common catenary posts on PKP.
Portal catenary on yard. With movable corners.
Typical parallel C section posts with L section distancers.
Parallel C section post with weights of two type. Cast iron (older) down and concrete (newer) up.
Two photos of parallel C section posts with extensions. Its a common practice in Silesia where track level is raised when ground level moving down.
Old style (since 1960's) convergent C section with flat section distancers on left. And concrete post 1980's style on right.
Convergent C section post with L section distancers very common style on PKP. And new posts convergent C section and dual round section distancers are present common style.
Convergent C section posts with flat distancers old 1960's style.
Portal yard catenary with rigid corners.
There are most common catenary posts on PKP. Of course on PKP existing a more styles catenary posts. Also H section similiary to swiss posts. And on a few yards existing a german style with cable hanging portals.
All my photos are made this year so all insulators are new present style. To mid 1990's the most common insulator style was single "saucer" style. Like on locomotive roof but made of brown ceramic.