2026/2027 EDITION | 350 PRACTICE QUESTIONS & ANSWERS | COMPREHENSIVE CERTIFICATION
TRANSIT RAILCAR
MAINTENANCE TECHNICIAN
EXAM 2026/2027
350 Practice Questions & Answers | Comprehensive Certification Study Guide
350 QUESTIONS DETAILED ANSWERS ALL SYSTEMS 2026/2027 EDITION
, EXAM COVERAGE AREAS
Comprehensive Certification Study Guide Covering All Railcar Systems
Electrical & Electronics Systems
• Low voltage & high voltage electrical troubleshooting
• Control circuits, relays, contactors, PLC basics
• Battery systems, charging circuits, auxiliary power
• Lighting, door control circuits, communication systems
• Wiring diagrams, schematics, multimeter use
Pneumatic, Brake & HVAC Systems
• Air brake systems: operation, troubleshooting, FRA regulations
• Pneumatic controls, valves, compressors, air supply
• HVAC: heating, ventilation, air conditioning operation & fault finding
• Door pneumatic systems & leveling systems
• Brake testing & inspection procedures
Mechanical, Trucks & Carbody
• Truck/bogie: wheels, axles, bearings, suspension
• Couplers, draft gear, carbody structure
• Doors, windows, interior fittings maintenance
• Friction brake components & wear limits
• Lubrication, preventive maintenance, inspections
Propulsion & Dynamic Brake Systems
• Propulsion: traction motors, inverters, choppers
• Dynamic brake operation & troubleshooting
• Third rail / catenary / pantograph interface
• Motor control, speed sensors, traction control
• Propulsion faults & diagnostics
Safety, Troubleshooting & Regulations
• OSHA safety, LOTO, PPE, fall protection, confined space
• FRA, FTA, APTA regulations & compliance
• Troubleshooting methodology & diagnostic tools
• Work orders, documentation, CMMS
• Quality, testing & commissioning after repair
Preventive Maintenance & 2026/2027 Updates
• Scheduled maintenance: daily, monthly, overhaul
• Predictive maintenance: vibration, thermal imaging
• New 2026/2027 tech: CBTC, PTC, energy storage, AC propulsion
• Case studies: fault isolation & root cause analysis
Transit Railcar Maintenance Technician Exam 2026/2027 | 350 Questions Page 2
,Transit Railcar Maintenance Technician Exam 2026/2027 | 350 Questions Page 3
, ELECTRICAL & ELECTRONICS
QUESTION 1: Electrical: What is the first step before working on high voltage
propulsion circuit?
A) De-energize, LOTO, verify zero energy, wear appropriate PPE
B) Start work immediately
C) Only wear gloves
D) Only inform supervisor
CORRECT ANSWER: A) De-energize, LOTO, verify zero energy, wear appropriate PPE
RATIONALE: Safety first per OSHA/NFPA 70E: de-energize circuit, apply Lockout/Tagout, verify zero
energy with tester, wear arc flash PPE, follow agency procedures for 600-750VDC propulsion.
QUESTION 2: Brake: What is the minimum brake cylinder pressure for effective braking
on transit railcar?
A) Varies by car type but typically 30-50 psi must build and hold, check for leakage
B) 5 psi is enough
C) No minimum
D) 100 psi always
CORRECT ANSWER: A) Varies by car type but typically 30-50 psi must build and hold,
check for leakage
RATIONALE: Brake cylinder pressure must build to spec (typically 30-50 psi service) and hold without
leakage per maintenance manual and FRA. Leakage test: brake pipe and cylinder leakage limits.
QUESTION 3: Mechanical: What indicates worn wheel flange needing replacement?
A) Flange thickness below minimum, height above maximum, or vertical wear per AAR limits
B) Only color change
C) Only noise
D) No wear limits
CORRECT ANSWER: A) Flange thickness below minimum, height above maximum, or
vertical wear per AAR limits
RATIONALE: Wheel wear limits per AAR: flange thickness minimum (e.g., 15/16 inch), flange height max,
tread hollow, vertical flange. Measure with wheel gauge. Replace if below limits.
QUESTION 4: Pneumatic: What causes air compressor to short cycle?
A) Leaks in air system, faulty governor/unloader, pressure switch out of adjustment
B) Only low temperature
C) Only high temperature
D) Normal operation
CORRECT ANSWER: A) Leaks in air system, faulty governor/unloader, pressure switch
out of adjustment
RATIONALE: Short cycling: system leaks causing pressure drop, governor/unloader valve sticking, pressure
switch settings incorrect, compressor discharge valves leaking. Troubleshoot leaks with soap test.
Transit Railcar Maintenance Technician Exam 2026/2027 | 350 Questions Page 4
TRANSIT RAILCAR
MAINTENANCE TECHNICIAN
EXAM 2026/2027
350 Practice Questions & Answers | Comprehensive Certification Study Guide
350 QUESTIONS DETAILED ANSWERS ALL SYSTEMS 2026/2027 EDITION
, EXAM COVERAGE AREAS
Comprehensive Certification Study Guide Covering All Railcar Systems
Electrical & Electronics Systems
• Low voltage & high voltage electrical troubleshooting
• Control circuits, relays, contactors, PLC basics
• Battery systems, charging circuits, auxiliary power
• Lighting, door control circuits, communication systems
• Wiring diagrams, schematics, multimeter use
Pneumatic, Brake & HVAC Systems
• Air brake systems: operation, troubleshooting, FRA regulations
• Pneumatic controls, valves, compressors, air supply
• HVAC: heating, ventilation, air conditioning operation & fault finding
• Door pneumatic systems & leveling systems
• Brake testing & inspection procedures
Mechanical, Trucks & Carbody
• Truck/bogie: wheels, axles, bearings, suspension
• Couplers, draft gear, carbody structure
• Doors, windows, interior fittings maintenance
• Friction brake components & wear limits
• Lubrication, preventive maintenance, inspections
Propulsion & Dynamic Brake Systems
• Propulsion: traction motors, inverters, choppers
• Dynamic brake operation & troubleshooting
• Third rail / catenary / pantograph interface
• Motor control, speed sensors, traction control
• Propulsion faults & diagnostics
Safety, Troubleshooting & Regulations
• OSHA safety, LOTO, PPE, fall protection, confined space
• FRA, FTA, APTA regulations & compliance
• Troubleshooting methodology & diagnostic tools
• Work orders, documentation, CMMS
• Quality, testing & commissioning after repair
Preventive Maintenance & 2026/2027 Updates
• Scheduled maintenance: daily, monthly, overhaul
• Predictive maintenance: vibration, thermal imaging
• New 2026/2027 tech: CBTC, PTC, energy storage, AC propulsion
• Case studies: fault isolation & root cause analysis
Transit Railcar Maintenance Technician Exam 2026/2027 | 350 Questions Page 2
,Transit Railcar Maintenance Technician Exam 2026/2027 | 350 Questions Page 3
, ELECTRICAL & ELECTRONICS
QUESTION 1: Electrical: What is the first step before working on high voltage
propulsion circuit?
A) De-energize, LOTO, verify zero energy, wear appropriate PPE
B) Start work immediately
C) Only wear gloves
D) Only inform supervisor
CORRECT ANSWER: A) De-energize, LOTO, verify zero energy, wear appropriate PPE
RATIONALE: Safety first per OSHA/NFPA 70E: de-energize circuit, apply Lockout/Tagout, verify zero
energy with tester, wear arc flash PPE, follow agency procedures for 600-750VDC propulsion.
QUESTION 2: Brake: What is the minimum brake cylinder pressure for effective braking
on transit railcar?
A) Varies by car type but typically 30-50 psi must build and hold, check for leakage
B) 5 psi is enough
C) No minimum
D) 100 psi always
CORRECT ANSWER: A) Varies by car type but typically 30-50 psi must build and hold,
check for leakage
RATIONALE: Brake cylinder pressure must build to spec (typically 30-50 psi service) and hold without
leakage per maintenance manual and FRA. Leakage test: brake pipe and cylinder leakage limits.
QUESTION 3: Mechanical: What indicates worn wheel flange needing replacement?
A) Flange thickness below minimum, height above maximum, or vertical wear per AAR limits
B) Only color change
C) Only noise
D) No wear limits
CORRECT ANSWER: A) Flange thickness below minimum, height above maximum, or
vertical wear per AAR limits
RATIONALE: Wheel wear limits per AAR: flange thickness minimum (e.g., 15/16 inch), flange height max,
tread hollow, vertical flange. Measure with wheel gauge. Replace if below limits.
QUESTION 4: Pneumatic: What causes air compressor to short cycle?
A) Leaks in air system, faulty governor/unloader, pressure switch out of adjustment
B) Only low temperature
C) Only high temperature
D) Normal operation
CORRECT ANSWER: A) Leaks in air system, faulty governor/unloader, pressure switch
out of adjustment
RATIONALE: Short cycling: system leaks causing pressure drop, governor/unloader valve sticking, pressure
switch settings incorrect, compressor discharge valves leaking. Troubleshoot leaks with soap test.
Transit Railcar Maintenance Technician Exam 2026/2027 | 350 Questions Page 4
