When I lived up there, they were using CF-7's. Now it looks like GP38's. I would say a couple times a week, but speed is limited to 15 IIRC.
So it's a nearly a Class 1 road! In Mexico I used to railfan along a railroad with only one to two moves a week every way, and with a 10-mph max speed... Motive power consists of U-Boats and GP38s as well...