The wheels on a box car are of either cast or forged steel in one of three types (class A, B, or Q representing an increasingly higher carbon content.

The wheels are mounted on steel shafts called axles. They also transmit the load from the journal bearings to the wheels. The axles are forged from medium carbon steel and weigh as much as 1,200 pounds. Both trucks are connected to cash loans center cash loans, which is basically the backbone of the carbody.

You won't normally see the center sill unless a car is off of the tracks and tipped over. The center sill also connects the pockets for the draft gear pay day loans and coupler assemblies, which transmit the push and pull loads that characterize overall train motion. The carbody is designed as a unit with the center sill, creating in effect a load-bearing "bridge" supported only at the center of both trucks. Most carbodies, including a box car, are built of copper-bearing, low-alloy, high-tensile steel.

Aluminum alloy cars (which are lighter, more durable, and more expensive than steel) can be found in specific services such as hauling coal in solid "unit" trains where the higher load pay day loans capacity of aluminum alloy open-top cars justifies the car's extra cost.

Take note if you're trackside and spot a freight car with a wooden carbody: They're now rare, if not extinct, in U.