Tread Worn Hollow
Shelled Tread
Gauge Usage
Wheel Gauging: Rim
Thin Rim
Truck Gauging: Friction Casting Rise
Barber S-2:
Ride Control:
Wheelset Gauging: Back to Back
Wheel Gauging: Wheel Flange
Vertical Flange & Thin Flange
High Flange
Learn about Railroading in North America