I went for a trip to a depot that I visit regularly and while there, I scouted the district for interesting pics of insulators to take. They are disappearing slowly as lines get upgraded and I like to record what I can. Some of them I think you would be interested to see. This double pole arrangement appears to have been upgraded with modern rubber 'stand offs' over the top of 6 sets of 4 'JD' disc strains which are of the 1927 vintage.

enjoy the pics.