Railroad Car Bearing

Railroad car bearings are the bearings that are used to support the weight of the railroad car and to provide smooth movement of the wheels on the rails. These bearings are subjected to heavy loads, shock loads and high speed rotation.

Types of Railroad Car Bearings

There are different types of bearings used in railroad cars. They are:

1. Ball Bearings: Ball bearings are the most common type of bearing used in railroad cars. They consist of a number of small balls that are held in a cage. The balls are free to rotate between the inner and outer races of the bearing. Ball bearings are suitable for high-speed applications.

2. Roller Bearings: Roller bearings are another type of bearing used in railroad cars. They consist of cylindrical rollers that are held in a cage. The rollers are free to rotate between the inner and outer races of the bearing. Roller bearings are suitable for heavy loads.

3. Needle Bearings: Needle bearings are a type of roller bearing that uses long, thin cylindrical rollers. They are suitable for high-speed applications and can handle heavy radial loads.

4. Partial Journal Bearings: Partial journal bearings are a type of bearing that is used to support the axle of the railroad car. They consist of a stationary bearing shell and a rotating shaft. The shaft is supported by a layer of lubricating oil that is supplied by the bearing shell. Partial journal bearings are suitable for heavy loads and high speeds.

Correct Answer

The correct answer is option 'D', i.e. Partial Journal Bearing. Partial Journal bearings are commonly used in railroad cars to support the axle of the car. They are suitable for heavy loads and high speeds.