The trucks look to be K-Line, but their mounting is homemade. Weaver and Crown Model couplers are separate from the truck casting. The floor area of the trucks looks to be fabricated out of plastic sheet material painted black. Some white plastic shows under the trucks.
It does look like Weaver or Crown Model, but someone cut out the higher plastic bolsters from the ends of the underframe to mount the heavier diecast sprung trucks as an improvement.
Jim