This is an n-scale roller bearing buckeye truck.
Originally designed specifically to mount on the QTTX131600 heavy duty flat car,
this is a modified generic version for use on other cars. Includes 4 trucks.
(The modification was to increase the ride height to be flush with the top of the truck. The trucks in the QTTX131600 flat car have a depressed ride height)
Axle Length: 0.5445"
Designed Wheel Diameter 33" (Full Scale)
Wheel Spacing 5' (Full Scale)
Mounting Point Height above Rails: 0.3307" (8.4mm)
Bolster Pin Clearance Diameter: .130" (3.3mm)
Customizations may be available if requested, subject to complexity.