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161. In broad general terms, why does Indian Railways classify locomotives separately for 'goods' and 'passenger' service (e.g., WDG vs WDP) despite both being diesel, Broad Gauge locomotives?
- A. Because goods locomotives cannot be driven by the same running staff
- B. Because goods and passenger services have different requirements for haulage (tractive effort) versus speed, so gearing/design is optimised differently
- C. Because goods locomotives use a completely different fuel type
- D. Because passenger locomotives never require any maintenance
Answer: Because goods and passenger services have different requirements for haulage (tractive effort) versus speed, so gearing/design is optimised differently
Explanation: Because goods and passenger services have different requirements for haulage (tractive effort) versus speed, so gearing/design is optimised differently — verified fact for Railway Mechanical Engineering Group B LDCE.
162. A locomotive's 'main alternator' (in a diesel-electric locomotive) is directly driven by:
- A. The diesel engine's crankshaft
- B. A separate small electric motor powered from the overhead wire
- C. The traction motors themselves
- D. The compressed air braking system
Answer: The diesel engine's crankshaft
Explanation: The diesel engine's crankshaft — verified fact for Railway Mechanical Engineering Group B LDCE.
163. 'Lubricating oil' in a locomotive diesel engine primarily serves to:
- A. Act as coolant for the overhead electric supply
- B. Ignite the fuel-air mixture in place of compression heat
- C. Reduce friction and wear between moving parts, and help carry away heat
- D. Provide electrical insulation for the traction motors
Answer: Reduce friction and wear between moving parts, and help carry away heat
Explanation: Reduce friction and wear between moving parts, and help carry away heat — verified fact for Railway Mechanical Engineering Group B LDCE.
164. The 'connecting rod' in a locomotive diesel engine links which two components?
- A. The piston and the crankshaft
- B. The fuel tank and the injector
- C. The pantograph and the overhead wire
- D. The radiator and the water pump
Answer: The piston and the crankshaft
Explanation: The piston and the crankshaft — verified fact for Railway Mechanical Engineering Group B LDCE.
165. A crankshaft in a locomotive diesel engine performs the function of:
- A. Generating the spark needed for ignition
- B. Filtering lubricating oil before it enters the engine
- C. Converting the reciprocating (up-down) motion of the pistons into rotary motion
- D. Storing compressed air for the braking system
Answer: Converting the reciprocating (up-down) motion of the pistons into rotary motion
Explanation: Converting the reciprocating (up-down) motion of the pistons into rotary motion — verified fact for Railway Mechanical Engineering Group B LDCE.
166. In diesel locomotives, 'turbocharging' of the engine is used to:
- A. Reduce the engine's compression ratio to zero
- B. Replace the need for a cooling system entirely
- C. Force more compressed air into the cylinders, allowing more fuel to be burnt and increasing engine power output
- D. Convert the diesel engine into an electric motor
Answer: Force more compressed air into the cylinders, allowing more fuel to be burnt and increasing engine power output
Explanation: Force more compressed air into the cylinders, allowing more fuel to be burnt and increasing engine power output — verified fact for Railway Mechanical Engineering Group B LDCE.
167. A 'traction motor blower' on a locomotive is used to:
- A. Blow the horn during station approach
- B. Force cooling air through the traction motors to prevent overheating during heavy load operation
- C. Cool the driver's cabin only
- D. Clean the locomotive's exterior body
Answer: Force cooling air through the traction motors to prevent overheating during heavy load operation
Explanation: Force cooling air through the traction motors to prevent overheating during heavy load operation — verified fact for Railway Mechanical Engineering Group B LDCE.
168. The main mechanical reason Indian Railways progressively adopted higher-horsepower diesel and electric locomotive classes over older ones is to:
- A. Reduce the number of wheels required per locomotive
- B. Eliminate the need for any maintenance schedule
- C. Haul heavier/longer trains at higher speeds, improving line capacity and operational efficiency
- D. Allow locomotives to run without any crew
Answer: Haul heavier/longer trains at higher speeds, improving line capacity and operational efficiency
Explanation: Haul heavier/longer trains at higher speeds, improving line capacity and operational efficiency — verified fact for Railway Mechanical Engineering Group B LDCE.
169. A locomotive's 'sand box/sanding equipment' is used to:
- A. Provide ballast weight for stability
- B. Deposit sand on the rail ahead of the driving wheels to improve adhesion, especially in wet or slippery conditions
- C. Filter dust out of the engine's intake air only
- D. Clean the locomotive's windscreen
Answer: Deposit sand on the rail ahead of the driving wheels to improve adhesion, especially in wet or slippery conditions
Explanation: Deposit sand on the rail ahead of the driving wheels to improve adhesion, especially in wet or slippery conditions — verified fact for Railway Mechanical Engineering Group B LDCE.
170. Modern locomotives use 'wheel slip/slide control' systems primarily to:
- A. Increase the locomotive's fuel consumption deliberately
- B. Disable the braking system during normal running
- C. Control passenger coach lighting
- D. Detect loss of adhesion and automatically adjust traction/braking effort to restore grip and prevent wheel/rail damage
Answer: Detect loss of adhesion and automatically adjust traction/braking effort to restore grip and prevent wheel/rail damage
Explanation: Detect loss of adhesion and automatically adjust traction/braking effort to restore grip and prevent wheel/rail damage — verified fact for Railway Mechanical Engineering Group B LDCE.
171. 'Wheel slip' in a locomotive occurs when:
- A. The locomotive's brakes are fully released with no other condition
- B. The driving wheels lose adhesion with the rail and spin faster than the locomotive's actual forward speed
- C. The fuel tank runs completely empty
- D. The pantograph loses contact with the overhead wire
Answer: The driving wheels lose adhesion with the rail and spin faster than the locomotive's actual forward speed
Explanation: The driving wheels lose adhesion with the rail and spin faster than the locomotive's actual forward speed — verified fact for Railway Mechanical Engineering Group B LDCE.
172. In diesel locomotive maintenance, periodic checking of 'fuel injectors' is important mainly because worn or faulty injectors can cause:
- A. Immediate derailment of the locomotive with no other symptoms
- B. Failure of the pantograph on the same locomotive
- C. Poor combustion, reduced fuel efficiency, increased emissions, and potential engine damage
- D. A drop in passenger coach air-conditioning performance only
Answer: Poor combustion, reduced fuel efficiency, increased emissions, and potential engine damage
Explanation: Poor combustion, reduced fuel efficiency, increased emissions, and potential engine damage — verified fact for Railway Mechanical Engineering Group B LDCE.
173. A locomotive's 'notch' setting, referred to by running/mechanical staff, generally refers to:
- A. A safety notch on the brake van only
- B. A discrete throttle position that controls engine power/traction output level
- C. A type of coupling used only on wagons
- D. A physical notch cut into the rail track for identification
Answer: A discrete throttle position that controls engine power/traction output level
Explanation: A discrete throttle position that controls engine power/traction output level — verified fact for Railway Mechanical Engineering Group B LDCE.
174. Which of these is a genuine general function of the 'governor' in a locomotive diesel engine?
- A. Controlling passenger ticket fares
- B. Regulating the overhead electric supply voltage
- C. Governing which railway division the locomotive is allocated to
- D. Regulating engine speed by controlling fuel delivery in response to load and throttle notch demands
Answer: Regulating engine speed by controlling fuel delivery in response to load and throttle notch demands
Explanation: Regulating engine speed by controlling fuel delivery in response to load and throttle notch demands — verified fact for Railway Mechanical Engineering Group B LDCE.
175. The general purpose of a suspension system on a locomotive's bogie (springs, dampers) is to:
- A. Absorb track irregularities and reduce dynamic forces transmitted to the locomotive body, improving ride quality and reducing wear
- B. Replace the need for a braking system
- C. Generate electrical power for the traction motors
- D. Increase the locomotive's top speed beyond its rated limit
Answer: Absorb track irregularities and reduce dynamic forces transmitted to the locomotive body, improving ride quality and reducing wear
Explanation: Absorb track irregularities and reduce dynamic forces transmitted to the locomotive body, improving ride quality and reducing wear — verified fact for Railway Mechanical Engineering Group B LDCE.
176. Why are locomotive bogies designed to pivot relative to the locomotive's main frame/body?
- A. To allow the locomotive to travel in reverse without a crew change
- B. To allow the wheelsets to align better with curved track and reduce wear/derailment risk while negotiating curves
- C. To reduce the total number of wheels needed
- D. To eliminate the need for any suspension system
Answer: To allow the wheelsets to align better with curved track and reduce wear/derailment risk while negotiating curves
Explanation: To allow the wheelsets to align better with curved track and reduce wear/derailment risk while negotiating curves — verified fact for Railway Mechanical Engineering Group B LDCE.
177. A 'bogie' in a locomotive is best defined as:
- A. The overhead structure that supplies electric power to the pantograph
- B. The main fuel storage tank of a diesel locomotive
- C. A wheeled sub-frame assembly carrying axles, wheels, suspension and (where powered) traction motors, which supports the locomotive body and can pivot to negotiate curves
- D. The driver's control cabin at the front of the locomotive
Answer: A wheeled sub-frame assembly carrying axles, wheels, suspension and (where powered) traction motors, which supports the locomotive body and can pivot to negotiate curves
Explanation: A wheeled sub-frame assembly carrying axles, wheels, suspension and (where powered) traction motors, which supports the locomotive body and can pivot to negotiate curves — verified fact for Railway Mechanical Engineering Group B LDCE.
178. The main mechanical/thermodynamic reason a diesel engine used in locomotives is generally more fuel-efficient than a comparable petrol engine is:
- A. Diesel engines have no moving parts, unlike petrol engines
- B. Diesel engines operate at a higher compression ratio, giving higher thermal efficiency
- C. Diesel fuel burns with no heat loss whatsoever
- D. Diesel engines run at a lower temperature than petrol engines in all cases
Answer: Diesel engines operate at a higher compression ratio, giving higher thermal efficiency
Explanation: Diesel engines operate at a higher compression ratio, giving higher thermal efficiency — verified fact for Railway Mechanical Engineering Group B LDCE.
179. A key advantage typically cited for electric traction over diesel traction on Indian Railways is:
- A. Electric traction eliminates the need for any braking system
- B. Electric locomotives never require any scheduled maintenance
- C. Electric locomotives can run without any external power source
- D. Lower running cost and reduced environmental emissions on electrified routes, along with generally higher haulage capability
Answer: Lower running cost and reduced environmental emissions on electrified routes, along with generally higher haulage capability
Explanation: Lower running cost and reduced environmental emissions on electrified routes, along with generally higher haulage capability — verified fact for Railway Mechanical Engineering Group B LDCE.
180. On Indian Railways, a locomotive classified WDP4B would be understood by mechanical staff as:
- A. A Broad Gauge, diesel-powered, passenger-service locomotive of a specific model/variant
- B. A Broad Gauge, electric, shunting-only locomotive
- C. A Metre Gauge, electric, freight-only locomotive
- D. A narrow-gauge steam locomotive
Answer: A Broad Gauge, diesel-powered, passenger-service locomotive of a specific model/variant
Explanation: A Broad Gauge, diesel-powered, passenger-service locomotive of a specific model/variant — verified fact for Railway Mechanical Engineering Group B LDCE.
181. The 'wheel arrangement' notation of a locomotive, such as Co-Co or Bo-Bo, is primarily useful to a mechanical engineer because it indicates:
- A. The number of bogies, number of axles per bogie, and whether each axle is independently powered
- B. The colour scheme applied to the locomotive body
- C. The manufacturing workshop of the locomotive
- D. The exact top speed of the locomotive in km/h
Answer: The number of bogies, number of axles per bogie, and whether each axle is independently powered
Explanation: The number of bogies, number of axles per bogie, and whether each axle is independently powered — verified fact for Railway Mechanical Engineering Group B LDCE.
182. A locomotive's 'pantograph' is a component found on which type of locomotive, and performs what function?
- A. A diesel locomotive; it filters engine lubricating oil
- B. An electric locomotive; it collects electric current from the overhead equipment (OHE)
- C. An electric locomotive; it compresses air for the brakes
- D. A diesel locomotive; it injects fuel into the cylinders
Answer: An electric locomotive; it collects electric current from the overhead equipment (OHE)
Explanation: An electric locomotive; it collects electric current from the overhead equipment (OHE) — verified fact for Railway Mechanical Engineering Group B LDCE.
183. The 'air compressor' fitted on a locomotive is mainly used to supply compressed air for:
- A. Supplying drinking water to the crew cabin
- B. Cooling the traction motors directly with compressed air only
- C. The braking system (and other pneumatic auxiliary functions such as the horn and sanding equipment)
- D. Powering the main diesel engine's combustion process
Answer: The braking system (and other pneumatic auxiliary functions such as the horn and sanding equipment)
Explanation: The braking system (and other pneumatic auxiliary functions such as the horn and sanding equipment) — verified fact for Railway Mechanical Engineering Group B LDCE.
184. In a diesel locomotive, the 'radiator/cooling system' primarily serves to:
- A. Filter diesel fuel before injection
- B. Dissipate heat from the engine coolant to keep the diesel engine within safe operating temperature
- C. Generate the primary electrical power for traction motors
- D. Compress air for the braking system
Answer: Dissipate heat from the engine coolant to keep the diesel engine within safe operating temperature
Explanation: Dissipate heat from the engine coolant to keep the diesel engine within safe operating temperature — verified fact for Railway Mechanical Engineering Group B LDCE.
185. A locomotive pilot's/loco running staff's periodic route learning and the mechanical staff's maintenance schedules both serve the same broader railway objective of:
- A. Reducing the total number of trains run each day
- B. Ensuring safe and reliable train operation
- C. Avoiding the need for any staff training
- D. Eliminating the need for signalling systems
Answer: Ensuring safe and reliable train operation
Explanation: Ensuring safe and reliable train operation — verified fact for Railway Mechanical Engineering Group B LDCE.
186. Which broad statement about Indian Railways' locomotive fleet composition trend in recent years is accurate?
- A. The share of electric locomotives has been increasing substantially as part of the railway electrification drive
- B. Steam locomotives remain the majority traction type in mainline service today
- C. Diesel locomotives have been completely eliminated from the fleet
- D. Electric traction has been discontinued in favour of diesel
Answer: The share of electric locomotives has been increasing substantially as part of the railway electrification drive
Explanation: The share of electric locomotives has been increasing substantially as part of the railway electrification drive — verified fact for Railway Mechanical Engineering Group B LDCE.
187. The role of RDSO (Research Designs and Standards Organisation) with respect to locomotives and rolling stock is best described as:
- A. Selling tickets and managing reservations
- B. Handling only the recruitment of Group B officers
- C. Setting technical standards, approving designs, and providing R&D/technical guidance to Indian Railways
- D. Operating passenger trains on a day-to-day basis
Answer: Setting technical standards, approving designs, and providing R&D/technical guidance to Indian Railways
Explanation: Setting technical standards, approving designs, and providing R&D/technical guidance to Indian Railways — verified fact for Railway Mechanical Engineering Group B LDCE.
188. An 'Electric Loco Shed' differs from a 'Diesel Shed' mainly in that it:
- A. Only maintains locomotives that never move out onto the main line
- B. Deals only with wagons, never with locomotives
- C. Has no maintenance pits or overhead facilities at all
- D. Maintains electric locomotives and their pantograph/traction-motor/electrical systems rather than diesel engines and fuel systems
Answer: Maintains electric locomotives and their pantograph/traction-motor/electrical systems rather than diesel engines and fuel systems
Explanation: Maintains electric locomotives and their pantograph/traction-motor/electrical systems rather than diesel engines and fuel systems — verified fact for Railway Mechanical Engineering Group B LDCE.
189. A 'Loco Shed' on Indian Railways primarily functions as:
- A. A base facility for stabling, fuelling, and carrying out day-to-day/periodic maintenance and inspection of locomotives
- B. A signal interlocking control centre
- C. A passenger reservation office
- D. A facility exclusively for manufacturing brand-new locomotives from raw materials
Answer: A base facility for stabling, fuelling, and carrying out day-to-day/periodic maintenance and inspection of locomotives
Explanation: A base facility for stabling, fuelling, and carrying out day-to-day/periodic maintenance and inspection of locomotives — verified fact for Railway Mechanical Engineering Group B LDCE.
190. The general purpose of following a defined maintenance schedule (trip inspection, periodic schedules, IOH, POH) for locomotives is to:
- A. Reduce the number of qualified staff required at a shed
- B. Increase locomotive weight for better adhesion
- C. Ensure reliability and safety by systematically detecting and correcting wear/defects before they cause failure
- D. Avoid the need for any daily visual checks at all
Answer: Ensure reliability and safety by systematically detecting and correcting wear/defects before they cause failure
Explanation: Ensure reliability and safety by systematically detecting and correcting wear/defects before they cause failure — verified fact for Railway Mechanical Engineering Group B LDCE.
191. Compared to trip inspection, a Periodical Overhaul (POH) of a locomotive is generally:
- A. A quicker check done more frequently than trip inspection
- B. A check that applies only to newly manufactured locomotives
- C. Something done only after a locomotive is condemned
- D. A much more thorough, less frequent overhaul involving detailed stripping, checking and reconditioning of major assemblies
Answer: A much more thorough, less frequent overhaul involving detailed stripping, checking and reconditioning of major assemblies
Explanation: A much more thorough, less frequent overhaul involving detailed stripping, checking and reconditioning of major assemblies — verified fact for Railway Mechanical Engineering Group B LDCE.
192. 'POH' in the context of locomotive/rolling stock maintenance generally stands for:
- A. Powered Overhead Haulage
- B. Preliminary Operating Handbook
- C. Post-Operation Handling
- D. Periodical Overhaul
Answer: Periodical Overhaul
Explanation: Periodical Overhaul — verified fact for Railway Mechanical Engineering Group B LDCE.
193. 'IOH' in the context of locomotive maintenance schedules generally stands for:
- A. Instant Operational Handover
- B. Initial Order for Homologation
- C. Internal Oil Handling
- D. Intermediate Overhaul
Answer: Intermediate Overhaul
Explanation: Intermediate Overhaul — verified fact for Railway Mechanical Engineering Group B LDCE.
194. 'Trip inspection' of a locomotive refers to:
- A. An inspection carried out exclusively by the Railway Board headquarters team
- B. A detailed engine overhaul carried out only once every ten years
- C. A once-in-a-lifetime inspection carried out only when the locomotive is first commissioned
- D. A frequent, relatively quick examination carried out at short intervals (before/after trips) to check basic safety and running condition
Answer: A frequent, relatively quick examination carried out at short intervals (before/after trips) to check basic safety and running condition
Explanation: A frequent, relatively quick examination carried out at short intervals (before/after trips) to check basic safety and running condition — verified fact for Railway Mechanical Engineering Group B LDCE.
195. The basic function of the fuel injection system in a locomotive diesel engine is to:
- A. Mix fuel with air well before it reaches the cylinder, as in a carburettor
- B. Cool the engine block using pressurised fuel circulation
- C. Deliver a precisely metered and timed quantity of fuel into the combustion chamber at high pressure
- D. Lubricate the crankshaft bearings using diesel fuel
Answer: Deliver a precisely metered and timed quantity of fuel into the combustion chamber at high pressure
Explanation: Deliver a precisely metered and timed quantity of fuel into the combustion chamber at high pressure — verified fact for Railway Mechanical Engineering Group B LDCE.
196. In a diesel engine (unlike a petrol/spark-ignition engine), ignition of the fuel-air charge occurs primarily due to:
- A. A spark plug firing at a precisely timed interval
- B. Heat generated by compressing air to a high pressure and temperature, which ignites the injected fuel
- C. Friction between the piston rings and cylinder wall
- D. An external pilot flame introduced into the cylinder
Answer: Heat generated by compressing air to a high pressure and temperature, which ignites the injected fuel
Explanation: Heat generated by compressing air to a high pressure and temperature, which ignites the injected fuel — verified fact for Railway Mechanical Engineering Group B LDCE.
197. The four-stroke cycle of a diesel engine, in order, consists of:
- A. Only compression and power, with intake and exhaust combined into one stroke
- B. Compression, exhaust, intake, and power only in that repeating pair
- C. Intake (suction), compression, power (combustion/expansion), and exhaust
- D. Power, intake, exhaust, and compression with no fixed order
Answer: Intake (suction), compression, power (combustion/expansion), and exhaust
Explanation: Intake (suction), compression, power (combustion/expansion), and exhaust — verified fact for Railway Mechanical Engineering Group B LDCE.
198. In a diesel-electric locomotive's basic power transmission chain, the correct general sequence is:
- A. Diesel engine drives an alternator/generator, which supplies electricity to traction motors that turn the wheels
- B. Traction motors generate power that is fed back to run the diesel engine
- C. Diesel engine compresses air which then drives the wheels pneumatically
- D. Diesel engine directly turns the wheels through a gearbox with no electrical stage
Answer: Diesel engine drives an alternator/generator, which supplies electricity to traction motors that turn the wheels
Explanation: Diesel engine drives an alternator/generator, which supplies electricity to traction motors that turn the wheels — verified fact for Railway Mechanical Engineering Group B LDCE.
199. In a diesel-electric locomotive, the traction motor is best described as:
- A. A hydraulic pump that drives the wheels using oil pressure
- B. A small diesel engine mounted directly on each axle
- C. An electric motor, usually mounted on the bogie, that converts electrical power (from the main alternator/generator) into rotational force to drive the wheels
- D. A compressed-air motor used only for starting the main engine
Answer: An electric motor, usually mounted on the bogie, that converts electrical power (from the main alternator/generator) into rotational force to drive the wheels
Explanation: An electric motor, usually mounted on the bogie, that converts electrical power (from the main alternator/generator) into rotational force to drive the wheels — verified fact for Railway Mechanical Engineering Group B LDCE.
200. In locomotive bogie terminology, why is 'independent axle drive' (each axle having its own traction motor) generally preferred over older rod-coupled drive arrangements?
- A. It removes the need for wheel profiling entirely
- B. It allows higher speeds with reduced hammer-blow effect and better adhesion utilisation
- C. It eliminates the need for any traction motor maintenance
- D. It allows the locomotive to run without any bogie at all
Answer: It allows higher speeds with reduced hammer-blow effect and better adhesion utilisation
Explanation: It allows higher speeds with reduced hammer-blow effect and better adhesion utilisation — verified fact for Railway Mechanical Engineering Group B LDCE.
201. The wheel arrangement notation 'Bo-Bo' used for locomotives means:
- A. Two bogies, each with two axles, mechanically coupled together
- B. Two bogies, each with two axles, and each axle independently driven
- C. One bogie with four coupled (non-independent) axles
- D. Two bogies, each with three axles, independently driven
Answer: Two bogies, each with two axles, and each axle independently driven
Explanation: Two bogies, each with two axles, and each axle independently driven — verified fact for Railway Mechanical Engineering Group B LDCE.
202. The wheel arrangement notation 'Co-Co' used for many Indian diesel and electric locomotives means:
- A. Two bogies, each with two axles, coupled together mechanically
- B. Two bogies, each with three axles, but none of them powered
- C. One bogie with six independently driven axles
- D. Two bogies, each with three axles, and each axle independently driven
Answer: Two bogies, each with three axles, and each axle independently driven
Explanation: Two bogies, each with three axles, and each axle independently driven — verified fact for Railway Mechanical Engineering Group B LDCE.
203. What does the prefix 'WAG' in an electric locomotive class such as WAG9 indicate about its intended service?
- A. Metre Gauge, AC traction, goods service
- B. Broad Gauge, AC traction, passenger-only service
- C. Broad Gauge, DC traction, goods service
- D. Broad Gauge, AC traction, Goods (freight) service
Answer: Broad Gauge, AC traction, Goods (freight) service
Explanation: Broad Gauge, AC traction, Goods (freight) service — verified fact for Railway Mechanical Engineering Group B LDCE.
204. What does the prefix 'WAP' in an electric locomotive class such as WAP7 indicate about its intended service?
- A. Metre Gauge, AC traction, passenger service
- B. Broad Gauge, AC traction, freight-only service
- C. Broad Gauge, DC traction, passenger service
- D. Broad Gauge, AC traction, Passenger service
Answer: Broad Gauge, AC traction, Passenger service
Explanation: Broad Gauge, AC traction, Passenger service — verified fact for Railway Mechanical Engineering Group B LDCE.
205. In locomotive classification, what does the third letter 'P' denote, as in WDP4?
- A. Pilot/shunting duty only
- B. Power-car for EMU rakes
- C. Prototype/experimental unit
- D. Passenger service
Answer: Passenger service
Explanation: Passenger service — verified fact for Railway Mechanical Engineering Group B LDCE.
206. In locomotive classification, the third letter denotes the type of service the locomotive is designed for. What does 'G' stand for, as in WDG4?
- A. General purpose only, never freight
- B. Gauge conversion unit
- C. Goods (freight) service
- D. Ground-level shunting only
Answer: Goods (freight) service
Explanation: Goods (freight) service — verified fact for Railway Mechanical Engineering Group B LDCE.
207. In diesel locomotive classification such as WDM3D, what does the letter 'D' (second position) indicate?
- A. Diesel traction
- B. Double-headed operation
- C. Drive-by-wire control
- D. Divisional allocation
Answer: Diesel traction
Explanation: Diesel traction — verified fact for Railway Mechanical Engineering Group B LDCE.
208. In Indian Railways diesel locomotive classification (e.g. WDM3D, WDG4), what does the letter 'W' at the start denote?
- A. Weight class of the locomotive
- B. Broad Gauge
- C. Metre Gauge
- D. Workshop of manufacture
Answer: Broad Gauge
Explanation: Broad Gauge — verified fact for Railway Mechanical Engineering Group B LDCE.
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