One note regarding the pole transformers: in many parts of the US they've migrated to underground cabling and larger transformers. My neighborhood has that, and we have about 1 transformer every 4 houses or so. No idea how big the transformer is from a kVA rating, but pretty much every house has 240V/200A service, so they must be pretty large. The transformers themselves are approximately 3' x 3' x 3' and enclosed in a box at the front of certain yards.