Not two-phase.
This is a three-phase, four-wire open delta. A delta, unlike a wye, can be achieved with only two transformers.
There probably are some two-phase circuits left in the world, but they grow increasingly scarce by the year. I've never seen two-phase, and I very much doubt I ever will.
Using a crossarm for the secondary is kind of archaic, isn't it? I've seen it in old pix from the '40s and earlier, but it's pretty rare nowadays, I think.
