Train Driver Train Operations and Controls 1 — Questions and Answers
Question 1: What is the primary purpose of the dynamic braking system on a locomotive?
- To convert kinetic energy into electrical energy to slow the train (Correct answer)
- To apply air pressure to the wheels
- To engage the hand brake automatically
- To reduce fuel consumption during acceleration
Correct answer: To convert kinetic energy into electrical energy to slow the train
Dynamic braking converts the locomotive's traction motors into generators, using electrical resistance to slow the train.
Question 2: What does the term 'independent brake' refer to on a locomotive?
- A brake that operates only on the locomotive's own wheels (Correct answer)
- A brake applied automatically when air pressure drops
- A brake controlled by the conductor
- A backup brake system for the entire train
Correct answer: A brake that operates only on the locomotive's own wheels
The independent brake controls only the locomotive's braking, separate from the train line air brakes.
Question 3: What is the function of the automatic brake valve (ABV) on a locomotive?
- Controls air brakes for the entire train consist (Correct answer)
- Controls only the locomotive's wheel brakes
- Regulates fuel flow to the engine
- Monitors speed and applies brakes automatically
Correct answer: Controls air brakes for the entire train consist
The automatic brake valve controls air pressure in the brake pipe, applying or releasing brakes throughout the entire train.
Question 4: At what air pressure is a train line considered fully charged in most US freight operations?
- 90 psi (Correct answer)
- 60 psi
- 120 psi
- 45 psi
Correct answer: 90 psi
A standard charged brake pipe in US freight operations is maintained at 90 psi.
Question 5: What action should a train driver take when experiencing a 'penalty brake application'?
- Bring the train to a complete stop before resetting the system (Correct answer)
- Accelerate to clear the affected zone quickly
- Switch to manual override immediately
- Reduce speed by 10 mph and continue
Correct answer: Bring the train to a complete stop before resetting the system
A penalty brake application requires the train to come to a full stop before the system can be reset and operation resumed.
Question 6: What is 'notching up' in locomotive throttle terminology?
- Increasing throttle in incremental steps to add power (Correct answer)
- Reducing speed before a grade
- Engaging the reverser for reverse movement
- Activating the horn at a grade crossing
Correct answer: Increasing throttle in incremental steps to add power
Notching up means advancing the throttle handle to higher numbered positions, increasing engine power in steps.
Train Driver Train Operations and Controls 1
What is the primary purpose of the dynamic braking system on a locomotive?