Several styles and sizes of transformer kits are designed to fit the Railfan Models HO scale Kasgro 325 Ton, 12 axle, depressed center flat cars. Parts are keyed so the ends fit the appropriate way. The magnets are already installed, so you just have to glue the bottom, sides and top together, then paint. Any shade of medium grey is prototypical.
Transformers this large are welded directly to the car body and rarely have any other bracing like cables or chains. In HO scale, this lets us easily and quickly remove the load, or swap it out with another, while maintaining prototype accuracy.
Hold the car with one hand while placing or removing the load. The transformer just drops into place on the center section of the car.