Am I missing something? What is the "gallows" next to the lantern? Looks like there's a small floodlight at the end, directed towards the lantern. Or what on earth it is...?

That's a door sensor.

Ah... I think I've never seen it detached like this. They're usually attached directly on the upper door frame or on the wall above.

neat! i suppose it has less of a chance of getting converted since its remote ballasted, ballast could be in the ceiling or wall..too hard to acress

If they really wanted to, it wouldn't be hard to run a new (name your voltage) feed in conduit and replace the fixture or stick a CFL in the remote ballast OV-25 but hopefully they'll keep things simple and just leave it MV.

Yeah, I think these have ballasts in the wall which might be why they remained MV. The rest of the lights at the yard (400w MV Flatbottom OV-25s) got replaced with 250w HPS Cooper OV-25s. Given that the TTC is putting up LED at a lot of their properties, I sure hope these guys don't get LED'd.

looks like a holophane arm? maybe not but ive seen this very arm with Refractopaks on some buildings more than once. RLS 200s as well.

Yeah, spot on, I think it's the same arm used with the Refractopacks.