Tim Horward, my apology for taking so long before responding. In my early career a Linenan shared with me his experiencing grabbing with both hands a single "live", in operation, 69kv line while standing in his bucket-Truck's extended, isolated bucket -He said that it was vibrating..., but made no remark of whether it felt warm.... Your above pgotograph shows a higher voltage transmission line -maybe 138kv.
Here's what I concluded as to why an office's single 120vac cut but live wire could set up a current through my hands, arms, and chest..., but the man with both hands on a high tension wire and sitting on a helicopter's platform does not have a delta-V nor current flow through his hands, arms and chest: High Tension wires have clean sinusoidal AC voltage produced by a Generato, transformed and transmitted through transformers; where as in offices operating all sorts of electrical devices these end-use equipment can set up harmonics and/or have partially failed or poorly designed input rectifier-transformers circuits that can "ping-back", impress, induce multiple frequency sinusoidal harmonics, or sawtooth, square wave, or othet repetitive spike, variant voltage on a single line -And this is what hung me.... You could take a bird or a man sitting below a helicopter of a line with thes delta-V's and they too would be shocked by current flowing through their hands (or bird's feet) and Body.
This concept was not realized by me until this experience; although, I knew about harmonic that computers can set up and cause undue heating on "live" wires.