I am not familiar with this model. The Mantua Hudson's four-wheel lead truck has transverse slot between the two axles, and a machine screw that goes into a tapped hole in the bottom of the cylinder block. This allows the truck to not only pivot, but slide sideways. A helical coil spring made of very light piano wire fits over the screw, providing downward pressure on the truck. It appears that this truck only allows the truck frame to move sideways, but doesn't allow the truck itself to rotate. One thing to check is to be sure there is clearance between the wheels and the insides of the cylinders. On some of my Mantua Hudsons, it was necessary to grind or file the insides of the cylinders to allow the wheels to clear. Perhaps this will help or give you some ideas.