The correct answer is: A. wheel burns.
When the driving wheels of a locomotive slip on the rail surface, it causes the wheels to heat up and can eventually cause the wheels to catch fire. This is known as wheel burns.
Wheel burns can be caused by a number of factors, including:
- Overheating of the brakes
- Improper lubrication of the wheels
- Excessive speed
- Improper alignment of the wheels
- Debris on the rail surface
Wheel burns can be a serious problem, as they can cause the wheels to derail and can also damage the rail surface. It is important to take steps to prevent wheel burns, such as:
- Properly maintaining the brakes
- Properly lubricating the wheels
- Avoiding excessive speed
- Maintaining proper alignment of the wheels
- Keeping the rail surface clean
B. hogging of rails is a condition in which the rail surface becomes raised in the center, causing the rail to curve upwards. This can be caused by a number of factors, including:
- Excessive weight on the rail
- Improper drainage
- Improper alignment of the rails
- Debris on the rail surface
C. scabbing of rails is a condition in which the rail surface becomes rough and uneven. This can be caused by a number of factors, including:
- Improper lubrication of the wheels
- Excessive speed
- Improper alignment of the wheels
- Debris on the rail surface
D. corrugation of rails is a condition in which the rail surface becomes wavy. This can be caused by a number of factors, including:
- Excessive weight on the rail
- Improper drainage
- Improper alignment of the rails
- Debris on the rail surface