AFAIK, there were two widely used manufacturers (in North America) of railroad signaling equipment back in the day: Union Switch and Signal, and General Railway Signal, and both made switch power machines.
This company:
At Patco we take pride in our remanufactured switch machines, because we can. Learn more about what Patco offers here.
patcoindustries.com
rebuilds them for railroad use even today.
If you are trying to model a specific part of Conrail, you problem might be identifying which one was used where, as Conrail was a conglomerate. I would be surprised if Conrail didn't use both.
That one was loosely labeled a "switch machine of eastern rail." There are a lot of images out there--search "railroad switch machines" and you'll find quite a few photos of the real ones...as well as images of the model railroad versions we use.
"Back in the day" white metal castings were available which could be set along trackside (Detail Associates mebbe), and I'd be surprised if they aren't still out there. I don't have a Walthers catalog handy, but I'd start there.
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You will probably also want remote unlocks for any manually thrown--aka un-powered--switches, such as a spur coming directly off a mainline or siding.
I haven't watched this video, but it probably answers most of your questions: