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Objectives• Describe the different train brake systems.
• List the different types of brake shoes.
• Describe how to identify common brake problems.
• Demonstrate a working knowledge of potential indicators, physical evidence and investigative techniques unique to brake system related fires.
Identification of train brake systems
• Air brakes– Locomotive– Railcar
• Hand brake– Wheel– Ratchet style
• Dynamic brake (electric)
Hot box, dragging equipment detector
• Notifies train and dispatcher of problem• Hotbox and dragging equipment records:
• Milepost number
• Total axle count
• Suspected axle number
• Time of notification
Specialized Investigative techniques:Items to note during investigation
• Multiple starts?• Origin area distance from track• Wheel surface condition• Rail surface condition at scene of fire• Area topography
– Uphill or downhill grade– Curve area where brakes may be applied
• Sidings
The elimination ofother fire causes
• Motor vehicles and equipment• Electrical utility / power lines• Children caused fires• Smoking• Railroad• Lightning• Debris burning or campfire• Incendiary• Other possible causes ?
Summary
• Air brakes, hand brakes, and dynamic brake grids can fail.
• Composition brake shoe material can be worn away, leaving the metal backing plate which can come in contact with the rail wheel.
• When a dynamic brake grid fails, the train crew may hear a loud noise or explosion. Dynamic brake grid fragments may be found both inside, and some distance away from the railroad tracks.
• Dynamic brake grid material may or may not be magnetic.
Summary
• When hand brakes are inadvertently engaged on a moving locomotives or rail car, you may see wheel discoloration, grooves worn into the wheel, and fragmented brake shoes.
• Metal brake shoes, although being phased out, should not be overlooked as a possible fire cause.
Test Questions
Brake shoe fires may:
A. Be found on flat ground
B. Be found on steep grades
C. Be found on either side of the right-of-way
D. All of the above
Test Questions
The metal backing plate from a composition brake shoe can cause a fire.
A. True
B. False
Test Questions
.Dragging equipment or hot box detector notifications are typically:
A. Known only by the train crew
B. Known only by the railroad dispatcher
C. Known by both the train crew and the railroad dispatcher