This could be the oldest power line entirely launched on steel lattice tower and it still exists. Note it was modified at least two times, first time a ground wire was added around 1907, on the second time the towers got their actual design. These tower can be found all the way Between Zamora, Iraupato and Guanajuato, while most towers are disused, few tower still serving distribution power lines.

https://reference.insulators.info/publications/view/?id=3414 https://reference.insulators.info/publications/view/?id=13588&h0=guanajuato