Every train is different. I've seen quite a few at or about 90-100 this year. Haven't kept track of what days might be longer, though I really don't think there's much of a pattern on that. Unless I'm at a job site I pretty much see everything that passes from my house.
I think the point is with P&W, just 3 or 4 years ago they used to run maybe 30-40 cars tops, one or two days a week, and occasionally light in one direction. Now its' rare to see just 30 cars, and they're always towing something. I could definitely see them opening it up to at least a 5 day a week run if another customer or two come online. Just a matter of more equipment and another crew (& relief) qualified to do it. With BRT expanding I suspect heavily it's not a matter of if, but when.
What this means for NY&A in terms of power is a little beyond me. Maybe they'll lease another gp. Even if the long rumored genset comes along it'll probably be needed for WM. The last few Bushwick moves I've seen late at night have either used all 3 sw1001s or an mp/gp combo to get up the grade. Looks like western beef's taking a few more cars down there too.