Electric Locomotive Maintenance Schedules

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Questions and Answers

What is the primary function of the trip inspection for electric locos?

To top-off oils and distilled water and address minor defects. (correct)

To review the permanent instructions from RDSO.

To perform complete repairs on the loco.

To issue the Engine Fitness Certificate.

How frequently should passenger/mail/express train locos undergo trip inspections?

Every 2500 km or one trip, whichever is earlier.

Every 1000 km.

Every 5000 km or every 10 days.

Every 2500 km or one trip, whichever is later. (correct)

What must happen before modifications to RDSO's instructions can be implemented?

Immediate implementation without approval.

Feedback information needs to be collected.

Discussed with engine examiners for feasibility.

Approval from RDSO is required. (correct)

What does the Engine Fitness Certificate signify?

The loco has passed its scheduled inspection or unscheduled repairs. Signup and view all the answers

Who is responsible for cancelling and destroying superseded instructions received from RDSO?

The CEE's office. Signup and view all the answers

Which type of service requires freight locos to have a trip inspection every 5000 km or 10 days, whichever is earlier?

Freight service. Signup and view all the answers

What should be visually inspected during a trip inspection?

The auxiliaries for starting and operation. Signup and view all the answers

What is the role of cages in axle roller bearings?

To keep rolling elements axially apart and prevent failure Signup and view all the answers

What type of fit is the inner ring of the axle roller bearing on the axle journal?

Interference fit Signup and view all the answers

What maintenance instruction applies specifically to axle box roller bearings with resilient thrust units?

MT. 04.004 Signup and view all the answers

Which types of defects should be examined during the overhaul of axle suspension roller bearings?

Indentation and spalling Signup and view all the answers

What serves to improve riding properties in locomotives fitted with Co-Co bogies?

Implementation of axial resilient thrust units on specific axles Signup and view all the answers

What is the purpose of the safety valves set at 11.5 kg/cm2 in the compressed air system?

To prevent build up of excessive air pressure Signup and view all the answers

At what pressure does the electro-pneumatic governor cut in for the compressors?

3.5±0.1 kg/cm2 Signup and view all the answers

What is the purpose of checking the roof during a general inspection?

To detect any foreign materials and abnormalities Signup and view all the answers

What happens when the pressure in the control reservoir falls below 6.0±0.1 kg/cm2?

Audio visual indication is triggered Signup and view all the answers

Which component should be checked visually for defects during the inspection?

Air Blast Circuit Breakers Signup and view all the answers

During which event is the visual indication activated in the driver’s cab?

Train parting incident Signup and view all the answers

What is the function of the A-9 automatic brake valve?

To adjust air pressure in the brake pipe Signup and view all the answers

What should be done to the suspension bearing oil level during inspections?

Top it up and record levels in a log book Signup and view all the answers

What is indicated by the feed valve's pressure switch when the pressure rises to 6.0±0.1 kg/cm2?

Visual indication cut off Signup and view all the answers

During which test should the voltage of the battery be recorded?

During preliminary tests with 25 kV supply Signup and view all the answers

Where is the compressed air stored after being cooled by after coolers?

In the main reservoirs Signup and view all the answers

What should be visually checked in the pantographs during an inspection?

Copper deposition and lubrication Signup and view all the answers

What is the objective of measuring the time taken to build up compressed air pressure?

To ensure the compressor operates satisfactorily Signup and view all the answers

What type of air brake valve is used for the application and release of independent air brakes on locomotives?

Self-lapping SA-9 type air brake valve Signup and view all the answers

What pressure is required for air to be stored in the control reservoir?

8 kg/cm2 Signup and view all the answers

Which action is essential when inspecting the battery?

Measure and record the voltage Signup and view all the answers

What should be done if foreign matter or dirt is found in the bogies?

Remove the foreign matter during inspection Signup and view all the answers

What is assessed when visually checking the spring and articulation of pantographs?

Flexibility and operational integrity Signup and view all the answers

What should be checked regarding the vacuum obtainable with the Driver Braking control Valve?

The leakage for 5 minutes after building up vacuum Signup and view all the answers

What should be recorded for springs in locomotives?

Free height and loaded height Signup and view all the answers

Which items should be checked at prescribed intervals for safety?

Mechanical clearances and dimensions Signup and view all the answers

Who specifies the limits for clearances in locomotives?

Chief Electrical Engineer Signup and view all the answers

What is the maximum coupler height tolerated in locomotives?

1105 mm Signup and view all the answers

Which clearance is checked during POH?

Clearance between bogie horn check and axle box horn face Signup and view all the answers

What is the permissible clearance tolerance for root wear in passenger locomotives?

4 mm Signup and view all the answers

Which intervals require checking of clearance between safety bracket and equaliser?

IB, IC, AOH, IOH, POH Signup and view all the answers

What record-keeping method is advised for preservation of measurements?

Handwritten registers or printed cards Signup and view all the answers

Which item should be checked for a difference of about 6 mm for freight locomotives?

Tyre profile root wear Signup and view all the answers

What is the periodicity for checking the clearance of spring plank from rail level?

IC, AOH, IOH, POH Signup and view all the answers

What is required before proposing changes to maintenance schedules connected with safety requirements?

Approval from RDSO after submission of a comprehensive proposal Signup and view all the answers

Where should the Annual Overhaul (AOH) inspection for AC electric locomotives be conducted?

Homing Electric Loco Shed Signup and view all the answers

Which type of inspection follows a Two-Monthly Inspection and should be completed within 5 days?

Four-Monthly Inspection Signup and view all the answers

What is the maximum allowable delay for an Intermediate Overhaul (IOH) after either 300,000 km or 3 years?

1 month Signup and view all the answers

What action should be taken if RDSO conveys an opinion against a provisional change made by the Chief Electrical Engineer?

Return to the original maintenance schedule Signup and view all the answers

What type of inspections are conducted at the Homing Electric Loco Shed?

Monthly Inspection and Four-Monthly Inspection Signup and view all the answers

What must occur before any modifications are implemented following a proposal other than those related to safety?

Post-facto approval from RDSO Signup and view all the answers

What feature allows the independent brakes on locomotives to be applied and released in steps with pressure maintaining capability?

Self-lapping type independent brakes Signup and view all the answers

Which function is provided by the emergency brake valve located at the assistant driver's seat?

To vent the brake pipe and vacuum train pipe simultaneously Signup and view all the answers

In case of a leakage in the feed pipe, how can the twin pipe brake system on trailing stock continue to function?

By converting to a single pipe system through isolation Signup and view all the answers

What is the primary advantage of having a dual brake system for hauling both graduated release and twin pipe air brake stock?

Compatibility with various brake types during operation Signup and view all the answers

Which feature ensures that dynamic brakes and automatic air brakes cannot be applied simultaneously on the locomotive?

Dynamic brake interlock Signup and view all the answers

What should be done with superseded instructions after they are received from RDSO?

They must be cancelled, withdrawn, and destroyed, except for one copy. Signup and view all the answers

Who has the authority to provisionally introduce changes to instructions from RDSO?

Sr.DEE (RS) with CEE's approval. Signup and view all the answers

What is the maximum distance between trip inspections for freight locos?

Every 5000 km or 10 days, whichever is earlier. Signup and view all the answers

What does the trip inspection primarily focus on?

Topping of oils and minor defect checks. Signup and view all the answers

When might the Engine Examiner conduct detailed checks on the locomotive?

If unusual occurrences are reported in the log book. Signup and view all the answers

What action should be taken regarding RDSO's modified instructions?

Notify RDSO of any provisional changes for final evaluation. Signup and view all the answers

What is the significance of the 'Engine Fitness Certificate' for passenger service locos?

It indicates that the loco has passed necessary inspections. Signup and view all the answers

What environmental conditions influence the requirements for trip inspections?

Hot, humid, and dusty conditions. Signup and view all the answers

What procedure is required when modifying RDSO instructions?

Conduct modifications after obtaining necessary approvals. Signup and view all the answers

What should be done if any foreign materials are found on the roof during inspection?

Remove the foreign materials and clean the roof. Signup and view all the answers

Which item must be visually checked for defects during a trip inspection?

Brake rigging. Signup and view all the answers

What is the purpose of checking the vacuum obtainable with the Driver Braking control Valve?

To assess the braking system's effectiveness. Signup and view all the answers

Which action should be taken regarding the oil level in suspension bearings during inspections?

Oil should be topped up and recorded in the logbook. Signup and view all the answers

What is essential to check regarding the performance of Air Blast Circuit Breakers?

The satisfactory operation of the circuit breakers. Signup and view all the answers

What must be inspected visually on the pantographs during maintenance?

The lubrication and copper deposition. Signup and view all the answers

Which parameter is NOT part of the preliminary tests conducted on a locomotive?

Check the response time of the locomotive acceleration. Signup and view all the answers

What is checked regarding the return current shunt during inspections?

Tightness of shunt connections. Signup and view all the answers

What should be checked immediately about the battery during inspections?

Voltage and topping up of cells if required. Signup and view all the answers

During a trip inspection, how should the overall condition of bogies be evaluated?

By removing any foreign matter and visually inspecting their parts. Signup and view all the answers

Which component's functionality should be observed specifically for abnormal noise during the inspection process?

Auxiliary Compressor motor (MCPA) Signup and view all the answers

What is measured and recorded specifically related to the performance of the main compressor during inspection?

Charging time of the main reservoir from 0 to 10 kg/cm2 Signup and view all the answers

Which test involves creating an earth fault to check the functionality of a specific relay?

Experience earth relay (QOA) Signup and view all the answers

What should be tested to observe the behavior during starting conditions in high voltage components?

Behavior of main compressors and generators Signup and view all the answers

Which parameter is essential to record while checking for leakage in the brake pipes during an inspection?

Rate of leakage in reservoir Signup and view all the answers

Which test involves observing contactors for any unusual sounds or sparking?

Observation of electrical contactors Signup and view all the answers

What specific form of inspection is conducted to assess the functioning of all lights in the locomotive?

High tension test Signup and view all the answers

What must be measured to assess the efficiency of the train's safety inspection regarding vacuum levels?

Vacuum obtainable with the driver braking control valve Signup and view all the answers

During the testing of the master controller, what specific feature is monitored?

Notch by notch progression and regression Signup and view all the answers

What action should be taken regarding the autodrain valves during inspection?

Confirm correct functioning Signup and view all the answers

Study Notes

Maintenance and Overhaul Schedules of Locomotives

Indian Railways have considerable experience maintaining electric locomotives since 1960.
Safety requirements and failure investigations have standardized various checks.
Standard equipment (pantographs, circuit breakers) are used in maintenance across locomotive types.
Maintenance schedules are based on manufacturer instructions for new rolling stock, zonal guidelines, and safety requirements, and experience in the operating environment (temperature, humidity, dust, etc.).
Schedules are optimized for existing electric locomotives but may require minor adjustment based on experience.
Railways may adjust schedules based on experience and modifications.
Changes requiring safety considerations require a proposal to RDSO with Chief approval.

Scheduled Inspections

Scheduled maintenance and overhaul schedules are outlined for electric locomotives.
Trip Inspections (IT), Monthly Inspections (IA), Two-monthly Inspections (IB), Four-monthly Inspections (IC), Annual Overhauls (AOH), Intermediate Overhauls (IOH), and Periodical Overhauls (POH) are defined.
Designated locations (sheds, workshops) are specified for each type of inspection.
Detailed instructions for each type and series of locomotives are provided in Annexure 3.01.
Inspection schedules are subject to revision based on accumulated experience.
Technical instructions are available in inspection books for specific tasks in each section and for individual parts.

Technical Instructions

Inspection Books outline the scope of work for various checks, procedures, and sections.
Inspection charts provide details, observations, and measuring equipment for each component.
Trouble-shooting charts offer step-by-step instructions for resolving specific issues.
Technical charts present repair and refitting details for different parts and equipment.

Engine Fitness Certificate

A form (Proforma 3.01 part A and 3.01 Part B) is used for recording the results of inspections.
The form captures detailed information about the nature of the test, conditions, and observations.
This form is used by maintenance staff.

Inspection of Electric Locos

Trip Inspection (TI) frequency depends on the type of service.
Checks include reviewing records, inspecting auxiliaries and mechanical components, and assessing environmental conditions.

Preliminary Tests

Checks include battery voltage, generator voltage, air pressure, safety valve operation, vacuum leakage tests, and more, for both with and without 25kV supply.
Testing procedures cover components like compressors, headlights, and auxiliary equipment.

Detailed Inspection Schedules (IA, IB, IC, AOH, IOH, POH):

Various mechanical and electrical components of the locomotives are detailed across several documents for different levels of inspection.
Specific tasks, frequencies, and tools are detailed for various components. This includes but is not limited to auxiliaries, terminals, brakes, bogies, and wheels.

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Description

This quiz covers the maintenance and overhaul schedules for electric locomotives used in Indian Railways since 1960. It includes standard equipment checks, optimized schedules based on environmental factors, and the processes for proposing safety changes. Test your knowledge on the key aspects of locomotive upkeep and safety requirements.