Prototype trucks and wheels

 
 
1 Barber stabiliizer truck
2 C-1 wedge lock XL truck
3 National C-1 truck
4 Buckeye truck
5 ASF ridemaster truck
6 ASF low clearance ride truck.
 
Back in 1960 the wheel size changed from 33 inch to standard of 36 inch for most cars, exceptions where 28 inch for piggyback cars and 38 inch for 125 ton cars.
 
Now for the truck Nomenclature:
 
1 Truck bolster
2 center plate
3 center plate liner
4 wheel/axle
5 brake rigging
6 truck side bearing
7 Journal roller bearing adapter
8 Roller bearing
9 truck springs
10 truck side frame.