Transit Railcar Maintenance Technician Certification
Exam Prep 2026/2027 | Q&A Study Guide
1. What is the primary purpose of a railcar truck assembly?
A) Provide passenger seating
B) Support and guide the railcar on tracks
C) Supply electrical power
D) Control braking system only
Answer: B) Support and guide the railcar on tracks
Rationale: The truck assembly supports the car body, houses wheelsets, and ensures
stable guidance along the rails.
2. What does a bogie refer to in railcar terminology?
A) Passenger seat row
B) Wheel and axle assembly
C) Brake control panel
D) Electrical cabinet
Answer: B) Wheel and axle assembly
Rationale: A bogie is another term for the truck assembly under railcars.
3. The component that directly connects the wheel to the axle is the:
A) Brake shoe
B) Journal bearing
C) Wheel hub
D) Coupler knuckle
Answer: C) Wheel hub
Rationale: The wheel hub is the mounting point that secures the wheel to the axle
assembly.
,4. What is the main purpose of railcar suspension systems?
A) Increase electrical load
B) Reduce shock and vibration
C) Improve lighting
D) Control braking force
Answer: B) Reduce shock and vibration
Rationale: Suspension systems, including springs and dampers, absorb track
irregularities to improve passenger comfort and reduce mechanical stress.
5. Which component prevents wheel slip during acceleration on railcars?
A) Circuit breaker
B) Compressor
C) Pantograph
D) Wheel slide protection system
Answer: D) Wheel slide protection system
Rationale: Wheel slide protection systems monitor wheel rotation and adjust braking or
traction to prevent wheels from locking or slipping, improving safety and reducing wear.
6. Which type of wheel defect can cause excessive vibration and noise in transit
railcars?
A) Flat spots
B) Worn bearings
C) Low air pressure
D) Electrical faults
Answer: A) Flat spots
Rationale: Flat spots occur on wheels due to locked wheels sliding along the rail during
braking, causing vibration and noise.
,7. What is the most common cause of wheel flat spots?
A) Excess lubrication
B) Wheel slip during braking
C) Overcharging batteries
D) Excess air pressure
Answer: B) Wheel slip during braking
Rationale: Flat spots commonly result from wheels locking and sliding during braking.
8. What tool is commonly used to measure wheel diameter wear?
A) Multimeter
B) Wheel caliper gauge
C) Torque wrench
D) Pressure gauge
Answer: B) Wheel caliper gauge
Rationale: Caliper gauges measure wheel diameter to detect wear limits.
9. What condition does wheel tread hollowing indicate?
A) Excess lubrication
B) Uneven wear pattern
C) Electrical failure
D) Brake release failure only
Answer: B) Uneven wear pattern
Rationale: Hollow tread wear results from uneven contact between wheel and rail.
10. What is wheel gauge measured between?
A) Rail head to rail base
B) Inside edges of rails
C) Outside edges of wheels
D) Coupler centers
, Answer: B) Inside edges of rails
Rationale: Gauge is the distance between the inner faces of the rails.
11. What is the primary cause of wheel flange wear?
A) Excessive speed
B) Negotiating curves
C) Over-braking
D) Electrical arcing
Answer: B) Negotiating curves
Rationale: Wheel flange wear is primarily caused by the lateral forces experienced when
negotiating curves.
12. What is the function of a journal bearing in a railcar truck?
A) Connect the wheels to the axle
B) Support the axle and reduce friction
C) Apply braking force
D) Transfer electrical power
Answer: B) Support the axle and reduce friction
Rationale: Journal bearings support the axle ends and reduce friction between the axle
and the truck frame.
13. What is the recommended method for inspecting wheel tread wear?
A) Visual inspection only
B) Caliper gauge measurement
C) Ultrasonic testing
D) Dye penetrant testing
Answer: B) Caliper gauge measurement
Rationale: Caliper gauges provide precise measurement of wheel tread wear to
determine if wheels are within tolerance.
Exam Prep 2026/2027 | Q&A Study Guide
1. What is the primary purpose of a railcar truck assembly?
A) Provide passenger seating
B) Support and guide the railcar on tracks
C) Supply electrical power
D) Control braking system only
Answer: B) Support and guide the railcar on tracks
Rationale: The truck assembly supports the car body, houses wheelsets, and ensures
stable guidance along the rails.
2. What does a bogie refer to in railcar terminology?
A) Passenger seat row
B) Wheel and axle assembly
C) Brake control panel
D) Electrical cabinet
Answer: B) Wheel and axle assembly
Rationale: A bogie is another term for the truck assembly under railcars.
3. The component that directly connects the wheel to the axle is the:
A) Brake shoe
B) Journal bearing
C) Wheel hub
D) Coupler knuckle
Answer: C) Wheel hub
Rationale: The wheel hub is the mounting point that secures the wheel to the axle
assembly.
,4. What is the main purpose of railcar suspension systems?
A) Increase electrical load
B) Reduce shock and vibration
C) Improve lighting
D) Control braking force
Answer: B) Reduce shock and vibration
Rationale: Suspension systems, including springs and dampers, absorb track
irregularities to improve passenger comfort and reduce mechanical stress.
5. Which component prevents wheel slip during acceleration on railcars?
A) Circuit breaker
B) Compressor
C) Pantograph
D) Wheel slide protection system
Answer: D) Wheel slide protection system
Rationale: Wheel slide protection systems monitor wheel rotation and adjust braking or
traction to prevent wheels from locking or slipping, improving safety and reducing wear.
6. Which type of wheel defect can cause excessive vibration and noise in transit
railcars?
A) Flat spots
B) Worn bearings
C) Low air pressure
D) Electrical faults
Answer: A) Flat spots
Rationale: Flat spots occur on wheels due to locked wheels sliding along the rail during
braking, causing vibration and noise.
,7. What is the most common cause of wheel flat spots?
A) Excess lubrication
B) Wheel slip during braking
C) Overcharging batteries
D) Excess air pressure
Answer: B) Wheel slip during braking
Rationale: Flat spots commonly result from wheels locking and sliding during braking.
8. What tool is commonly used to measure wheel diameter wear?
A) Multimeter
B) Wheel caliper gauge
C) Torque wrench
D) Pressure gauge
Answer: B) Wheel caliper gauge
Rationale: Caliper gauges measure wheel diameter to detect wear limits.
9. What condition does wheel tread hollowing indicate?
A) Excess lubrication
B) Uneven wear pattern
C) Electrical failure
D) Brake release failure only
Answer: B) Uneven wear pattern
Rationale: Hollow tread wear results from uneven contact between wheel and rail.
10. What is wheel gauge measured between?
A) Rail head to rail base
B) Inside edges of rails
C) Outside edges of wheels
D) Coupler centers
, Answer: B) Inside edges of rails
Rationale: Gauge is the distance between the inner faces of the rails.
11. What is the primary cause of wheel flange wear?
A) Excessive speed
B) Negotiating curves
C) Over-braking
D) Electrical arcing
Answer: B) Negotiating curves
Rationale: Wheel flange wear is primarily caused by the lateral forces experienced when
negotiating curves.
12. What is the function of a journal bearing in a railcar truck?
A) Connect the wheels to the axle
B) Support the axle and reduce friction
C) Apply braking force
D) Transfer electrical power
Answer: B) Support the axle and reduce friction
Rationale: Journal bearings support the axle ends and reduce friction between the axle
and the truck frame.
13. What is the recommended method for inspecting wheel tread wear?
A) Visual inspection only
B) Caliper gauge measurement
C) Ultrasonic testing
D) Dye penetrant testing
Answer: B) Caliper gauge measurement
Rationale: Caliper gauges provide precise measurement of wheel tread wear to
determine if wheels are within tolerance.
