The towers came from a spot about where the Buffalo, Rochester & Pittsburgh Railway right-of-way crosses today's New York Thruway (twice) about 5 miles west of the junction with I-690 on either side of the Peru substation. The Beebe Syndicate put hundreds of identical towers on most of their lines in New York State, and similar ones were used on various lines, so they weren't particularly rare. Towers from the same source were also used on Northern Ohio Traction & Light and Boston & Maine's Hoosac Tunnel electrification, among others.
RS&E's catenary used 4/0 round wire (crimp-on clamps) with a 500,000cm copper messenger. Where direct suspension was used the messenger was carried as a feeder cable. Seashore's installation has a mix of 4/0 and 2/0 grooved wire (screw clamps), with a steel messenger. RS&E used single rod hangers, Seashore has various kinds. Neither used inclined catenary - RS&E placed mid-span poles where pull-offs were needed.