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Key Facts: Engineer Railway Vehicles Exam

80 items

Official written paper length (4 subjects × 20)

Q-Net Engineer-grade grading method; Enforcement Rule [별표 8]; Q-Net 철도차량기사 page

120 minutes

Written CBT timing (30 minutes per subject)

Q-Net 필기시험 안내 (기사 과목별 30분)

40 / 60

Written per-subject passing floor and overall average

Q-Net 검정기준 및 방법 (기사)

KRW 19,400

Written registration fee on Q-Net

Q-Net crf005 jmCd=1030, checked 2026-09-20

KRW 22,600

Practical registration fee on Q-Net

Q-Net crf005 jmCd=1030, checked 2026-09-20

150 minutes

Practical descriptive exam duration (철도차량설계 및 점검 실무)

Q-Net 출제기준 및 시행계획 공고

2 years

Written-pass exemption period from the pass date

National Technical Qualifications Act Enforcement Decree Article 21

철도차량기사 is HRD Korea's Engineer-grade qualification under MOLIT for rolling stock design, manufacturing, and maintenance engineers. The written CBT exam features 80 four-option questions across four subjects (20 items each, 120 minutes total), requiring at least 40 points per subject (과락 floor) and an overall average of 60 points. A subsequent 150-minute written descriptive practical exam (KRW 22,600) tests vehicle design and maintenance inspection practice. OpenExamPrep offers 100 independent English practice MCQs covering those written topics.

Sample Engineer Railway Vehicles Practice Questions

Try these sample questions to review concepts for the Engineer Railway Vehicles exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under Korean railway construction practice cited for vehicle design, how is track gauge (궤간) measured, and what is the Korean standard-gauge value?
A.Distance between rail centerlines at the rail head, 1520 mm
B.Distance between wheel flanges at the axle, 1067 mm
C.Distance over the outer faces of the rails at the foot, 1435 mm
D.Shortest distance between the inner faces of the two rails, taken 14 mm below the rail running surface, 1435 mm
Explanation: Korean construction rules measure gauge as the shortest inner-face distance between the two rails, referenced 14 mm below the running surface. The Korean standard gauge used for conventional, high-speed, and most steel-wheel urban lines is 1435 mm. Wheelset and bogie designers size back-to-back spacing and flange clearance from that gauge, not from rail centerlines or flange-to-flange guesses.
2In the Davis-type running-resistance (주행저항) model used for traction and braking design, which term grows with the square of speed?
A.Journal and rolling mechanical resistance, treated as independent of speed
B.Grade resistance mg·i
C.Aerodynamic drag, written with a coefficient times V² (or ½ Cd ρ A v²)
D.Curve resistance, which depends only on radius and gauge
Explanation: Davis (and KS R 9217 running-resistance tests) split resistance into a nearly constant mechanical part, a linear viscous part, and a quadratic aerodynamic part. The V² term is air drag on the nose, sides, and inter-car gaps. Grade and curve forces are geometry terms and are added separately from the Davis speed polynomial.
3On a constant 10‰ rising grade, taking g = 10 m/s², what is the grade resistance of a 200 t train?
A.2 kN
B.200 kN
C.20 kN
D.2 MN
Explanation: Grade resistance is Fg = m g i. Here m = 200 000 kg, g = 10 m/s², i = 10‰ = 0.010, so Fg = 200 000 × 10 × 0.010 = 20 000 N = 20 kN. Equivalently, each tonne contributes about 10 kgf on a 10‰ grade, so 200 t → 2000 kgf ≈ 20 kN.
4In a typical Korean EMU bogie, what is the primary role of the primary suspension (1차 현가) between the axleboxes and the bogie frame?
A.To carry the full carbody mass on air bags and control floor height
B.To generate tractive effort at the rail
C.To isolate high-frequency unsprung-mass vibration of the wheelset from the bogie frame and to provide axlebox guidance stiffness
D.To open and close passenger plug doors
Explanation: Primary suspension (coil, conical rubber, or axlebox springs plus longitudinal/lateral guidance such as a monolink) sits between the wheelset and the bogie frame. It filters short-wavelength track roughness and sets the wheelset kinematic stiffness that governs hunting and curving. Secondary air springs support the carbody and control floor height; they are not the primary stage.
5Why do conventional steel wheels use a conical (or worn-conical) tread profile (답면 구배) rather than a purely cylindrical tread?
A.To eliminate all creep forces in every curve
B.To increase the legal track gauge from 1435 mm to 1520 mm
C.To provide a rolling-radius difference between the two wheels of a rigid axle so the wheelset can steer into curves and to give a restoring action on tangent track
D.To replace the flange as the only derailment barrier
Explanation: A 1/20-class cone (or a worn equivalent conicity) makes the outer wheel roll on a larger radius in a curve, generating a steering yaw toward the curve. On straight track a small lateral offset produces a restoring radius difference. Cylindrical treads do not self-steer and hunt more readily. The flange remains the last geometric stop; the cone does not change Korean gauge.
6What is axle load (축중) as used in rolling-stock performance and infrastructure interface design?
A.The mass of one traction motor only
B.The lateral flange force Q used in Nadal’s formula
C.The vertical force (or equivalent mass) transmitted to the rail by one axle, usually quoted per axle in tonnes or kN
D.The brake-pipe pressure in kilopascals
Explanation: Axle load is the vertical wheelset load on the track, a primary interface limit for bridges, rail bending, and vehicle strength cases. Designers also use it to size brakes (adhesion) and to check static wheel-load balance. It is not a motor mass, a lateral Q force, or a pneumatic pressure.
7Why do bogie designers try to keep unsprung mass (비현가 질량) low?
A.Because unsprung mass does not affect rail impact or ride
B.Because unsprung mass is the only mass that produces regenerative energy
C.Because wheelset, axlebox, and gearbox mass that is not isolated by the primary springs increases dynamic wheel-rail force and track damage
D.Because Korean KRTS forbids any axle-hung traction motor
Explanation: Unsprung mass moves with the wheelset over every rail irregularity. Higher unsprung mass raises P2-type impact, rolling noise, and fatigue of rails and axles. Primary springs isolate the bogie frame and carbody; motors may be axle-hung or frame-hung depending on the vehicle, but KRTS does not ban axle-hung motors as a class.
8In MOLIT 철도용품 기술기준 for solid wheels (KRTS-CO-Part3-1), how are wheel types W1 and W2 classified?
A.W1 for rubber-tyred metros only; W2 for monorail only
B.W1 for freight wagons only; W2 for passenger cars only
C.W1 for service speed 200 km/h and above; W2 for service speed below 200 km/h
D.W1 and W2 differ only by paint color, not by speed
Explanation: KRTS-CO-Part3-1 classifies integral steel wheels as type 1 (W1) for running speed 200 km/h or more and type 2 (W2) below 200 km/h. Material, heat treatment, and test severity follow that speed split. The classes are not rubber-tyre versus monorail and are not a paint distinction.
9A traction package delivers 1500 kW at the wheel rims at 54 km/h on level tangent track. Neglecting losses already inside that 1500 kW figure, what tractive effort is available?
A.27.8 kN
B.54 kN
C.100 kN
D.1500 kN
Explanation: Power P = F v. With P in kW and v in km/h, F (N) = 3600 P / v, so F = 3600 × 1500 / 54 = 100 000 N = 100 kN. That is the rim effort consistent with 1.5 MW at 15 m/s (54 km/h).
10A 250 t train has 50 kN net accelerating force after subtracting running resistance (no grade). What is the translational acceleration if rotary inertia is neglected?
A.0.02 m/s²
B.5.0 m/s²
C.2.0 m/s²
D.0.20 m/s²
Explanation: Newton’s second law: a = F / m = 50 000 N / 250 000 kg = 0.20 m/s². Rotary inertia of wheelsets and motors would raise equivalent mass and slightly lower a; the stem asked to neglect that factor.

About the Engineer Railway Vehicles Exam

Engineer Railway Vehicles (철도차량기사) is South Korea's national technical qualification for rolling stock engineers, rolling stock manufacturers (such as Hyundai Rotem), rolling stock operators (such as KORAIL, SR, Seoul Metro), and maintenance depots. Supervised by the Ministry of Land, Infrastructure and Transport (MOLIT) and administered by HRD Korea on Q-Net (jmCd 1030), the qualification evaluates deep competence in high-speed rail (KTX, SRT), electric multiple units (EMU), locomotives, and urban transit systems. The written examination tests carbody structural design, crashworthiness (EN 10307), bogie running dynamics, wheel-rail contact mechanics, pneumatic braking and brake blending, VVVF inverter propulsion, TCMS train communication networks, non-destructive testing (NDT), and Korean Railway Safety Law inspection cycles. Following the written examination, candidates take a 150-minute written descriptive practical exam in rolling stock design and maintenance practice. The 100 questions here provide an independent English-language MCQ study adaptation.

Exam sponsor: HRD Korea (Q-Net) / Ministry of Land, Infrastructure and Transport (MOLIT). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Written CBT examination covering Railway Vehicle Design (철도차량설계), Railway Vehicle Structure (철도차량구조), Railway Vehicle Control (철도차량제어), and Railway Vehicle Inspection and Testing (철도차량 검사 및 시험) (20 items and 30 minutes each, total 80 items and 120 minutes), followed by a 150-minute written descriptive practical examination in Railway Vehicle Design and Inspection Practice (철도차량설계 및 점검 실무). OpenExamPrep study weights match the four equal written subjects.

Time Limit

120 minutes for the four written subjects (30 minutes each); 150 minutes for the written descriptive practical examination

Passing Score

Written: 40+ per subject (과락 floor) and 60 average out of 100; practical: 60/100

Exam / Certification Fees

KRW 19,400 written / KRW 22,600 practical (Q-Net, 2026-09-20)

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

25%

Railway Vehicle Design (철도차량설계)

Bodyshell structural mechanics (aluminum double-skin extrusions vs stainless steel), finite element structural stiffness and modal vibration (vertical bending, torsion), crashworthiness design (EN 10307, collision energy absorption tubes, anti-climbers), vehicle aerodynamics (drag force Fd = 1/2·Cd·ρ·A·v², tunnel micro-pressure wave, interior pressure transients), bogie frame design (welded box girder, H-frame), primary and secondary suspension systems (conical rubber springs, air springs, auto-leveling valves, yaw dampers), wheelset stress, conical tread profiles (1/20, 1/40, worn profiles), wheel-rail Hertzian contact and Kalker creep forces, Nadal derailment limit ((Q/P)lim = (tanδ - μ)/(1 + μ tanδ)), and critical hunting speed.

25%

Railway Vehicle Structure (철도차량구조)

Couplers and drawbars (tightlock couplers, Shibata-type automatic couplers, semi-permanent drawbars, rubber draft gears, hydraulic crash buffers), inter-car gangways and acoustic diaphragms, passenger door systems (sliding plug doors, electric screw drive vs pneumatic mechanisms, sensitive edge obstacle detection), emergency detrainment doors, passenger salon HVAC (cooling capacity sizing, heat pump heating, fresh air ventilation rates per passenger), pneumatic brake systems (brake pipe BP 5 bar, main reservoir MR 8-9 bar, brake cylinders, rigging, tread brake units vs axle/wheel-mounted brake discs), friction materials (sintered metal vs organic composite pads), wheel slide protection (WSP dump valves, speed sensors), dynamic regenerative and friction brake blending, and spring-applied pneumatic-release parking brakes.

25%

Railway Vehicle Control (철도차량제어)

High-voltage electrical propulsion chain, main traction transformers (leakage inductance, forced oil/air cooling), 4-quadrant PWM line converters for AC traction power, intermediate DC link capacitor filtering, 2-level and 3-level VVVF inverters with IGBT modules, field-oriented vector control (FOC) of 3-phase induction traction motors and permanent magnet synchronous motors (PMSM), regenerative braking energy feedback, auxiliary power supply (static inverter SIV, DC-DC chopper, 100V DC battery bank, emergency lighting), Train Control and Monitoring System (TCMS, Multifunction Vehicle Bus MVB, Wire Train Bus WTB, Train Communication Network TCN, industrial Ethernet), driver machine interface (DMI), event recorders, and train safety/signaling interfaces (ATS, ATP/ATC speed profiles, KTCS-2, CBTC onboard transponder antenna, balise transmission module BTM, deadman vigilance control).

25%

Railway Vehicle Inspection and Testing (철도차량 검사 및 시험)

Maintenance classifications under the Korean Railway Safety Act (철도안전법: daily/trip inspection, regular monthly inspection, intermediate inspection, and heavy overhaul; time- and running-distance-based maintenance cycles), non-destructive testing (ultrasonic testing UT of axles, magnetic particle testing MT of bogie frame welds, liquid penetrant testing PT), wheel flange height, thickness, and back-to-back distance measurement using calipers, wheel reprofiling on underfloor wheel lathes, electrical insulation resistance tests (megohmmeter), dielectric withstand voltage tests, contact resistance, motor surge testing, static wheel load measurement and corner weight balancing, dynamic brake stopping distance verification from maximum speed, ride comfort index (Sperling's index Wz, ISO 2631 whole-body vibration), and exterior/interior acoustic noise compliance.

Preparing for the Engineer Railway Vehicles Exam

What You Need to Know

  • Passing score: Written: 40+ per subject (과락 floor) and 60 average out of 100; practical: 60/100
  • Assessment: Written CBT examination covering Railway Vehicle Design (철도차량설계), Railway Vehicle Structure (철도차량구조), Railway Vehicle Control (철도차량제어), and Railway Vehicle Inspection and Testing (철도차량 검사 및 시험) (20 items and 30 minutes each, total 80 items and 120 minutes), followed by a 150-minute written descriptive practical examination in Railway Vehicle Design and Inspection Practice (철도차량설계 및 점검 실무). OpenExamPrep study weights match the four equal written subjects.
  • Time limit: 120 minutes for the four written subjects (30 minutes each); 150 minutes for the written descriptive practical examination
  • Exam / certification fees: KRW 19,400 written / KRW 22,600 practical (Q-Net, 2026-09-20) Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

Engineer Railway Vehicles: Suggested Study Strategy

1Master the fundamental vehicle dynamics formulas: Nadal's derailment criterion ((Q/P)lim = (tanδ - μ)/(1 + μ tanδ)), aerodynamic drag force (Fd = 1/2·Cd·ρ·A·v²), Klingel's formula for wheelset hunting wavelength, and deceleration/braking distance calculations (v² = 2·a·s).
2Pay equal attention to all four subjects to prevent failing on the 40-point per-subject floor (과락), especially Railway Vehicle Control (VVVF, 4-quadrant converters, TCMS) which mechanical engineering candidates often find challenging.
3Thoroughly understand Korean Railway Safety Act (철도안전법) maintenance classifications (일상/주행검사, 월상검사, 중간검사, 중정비) and wheel tread/flange wear limit dimensions (flange height, flange thickness, back-to-back distance).
4Practice multi-step worked numerical problems: calculating required braking force, motor power during acceleration against grade and aerodynamic resistance, heat dissipation in brake discs, and Sperling comfort index Wz.

Frequently Asked Questions

What is Engineer Railway Vehicles (철도차량기사)?

Engineer Railway Vehicles (철도차량기사) is South Korea's national technical qualification for railway rolling stock engineers, administered by the Human Resources Development Service of Korea (HRD Korea / Q-Net) under the Ministry of Land, Infrastructure and Transport (MOLIT). It certifies engineering knowledge in vehicle structural design, bogie dynamics, electrical propulsion and train control, pneumatic braking, and maintenance inspection.

What is the official exam structure and passing standard in 2026?

The written examination consists of 80 four-option multiple-choice questions across four subjects: Railway Vehicle Design, Railway Vehicle Structure, Railway Vehicle Control, and Railway Vehicle Inspection and Testing (20 questions each, 120 minutes total). Candidates must achieve at least 40 points in each subject (과락 passing floor) and an overall average score of 60 points or higher out of 100. Passing the written exam qualifies the candidate for the 150-minute written descriptive practical exam (철도차량설계 및 점검 실무), where a score of 60/100 or higher is required to earn the certification.

What are the official fees and validity of exam passes?

According to Q-Net (jmCd 1030), the written examination fee is KRW 19,400 and the practical examination fee is KRW 22,600. Under Article 21 of the National Technical Qualifications Act Enforcement Decree, passing the written examination provides an exemption from the written test for two years, allowing candidates to take or retake the practical exam within that timeframe.

What is this 100-question practice bank?

This 100-question English-language multiple-choice question bank is an independent study resource developed by OpenExamPrep. It covers core theoretical principles, dynamic calculations, system engineering concepts, and Korean Railway Safety Law standards matching the four written exam subjects (25 questions per subject). It is not an official translation or released Q-Net paper, but a rigorous technical preparation aid.

What career paths benefit from the Engineer Railway Vehicles qualification?

The credential is a premier qualification for engineering roles at rolling stock manufacturers (such as Hyundai Rotem, Woojin Industrial Systems, Dawonsys), railway operating corporations (such as KORAIL, SR, Seoul Metro, Busan Transportation Corporation), railway research institutions (KRRI), and safety inspection agencies (Korea Transportation Safety Authority - TS).