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On Average, 3 Truck Sets per Train Have Dragging Brake Sets.,[object Object],Eugene Matzan   http://www.matzan.comematzan1@rochester.rr.com Phone 1 585 387 8921,[object Object]
These images are infrared images taken of a moving freight train.  The image on the left is a normal car with the wheel bearings showing a slight buildup in temperature.  The image on the right is a dragging brake causing the entire wheel to heat because of the additional friction.  ,[object Object],Eugene Matzan   http://www.matzan.comematzan1@rochester.rr.com Phone 1 585 387 8921,[object Object]
The typical grease used in these railroad car wheel bearings is Lithium based grease.  The recommended temperature range is 70°C over ambient temperature.  The chart below shows the temperature range of a nominal Lithium based grease.,[object Object],Figure 1 shows the thermal range of a typical rolling element bearing used in Railcars. The green zone represents the sweet spot for bearing and lubrication temperature; operating in the yellow zone reduces lubricant and bearing life; and if your bearings are in the red zone, expect both the bearing and the lubricant to be destroyed rapidly.  For every 15°C increase in temperature above 70°C, the lubricant life is more than halved and there is a negative effect on bearing life. Any mineral oil operating at a temperature above 80°C or 90°C will have a greatly diminished life. In no case should bearing temperature ever exceed the maximum rating of either the bearing or the lubricant. ,[object Object]
This buildup of heat causes rapid lubricant deterioration resulting in bearing damage.,[object Object],Because Railroad wheels and bearings are slow moving, they may run on bad bearings for a long time before Catastrophic Failure,[object Object],Even though the bearings do not totally seize , the increased rolling friction and continuing brake drag:,[object Object],[object Object]
Increased Track Wear
Damage Wheels
Damaged Wheel Bearings
Leading to Catastrophic Failure and Train DerailmentsEugene Matzan   http://www.matzan.comematzan1@rochester.rr.com Phone 1 585 387 8921,[object Object]

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Railroad Car Wheel Defects