Rolling Stock Design Criteria - Copy

Rolling Stock The moving component of a railway system are called as Rolling stock of the railways. It includes all types of: •

Locomotives

•

Wagons

•

Coaches

Organizatio ns The following authorities, agencies and organizations are responsible for designing the rolling stock: 

FRA (Federal Railroad Administration)

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APTA (American Public Transportation Association)

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AAR (Association of American Railroads)

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State of Colorado

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NFPA (National Fire Protection Association)

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OSHA (Occasional Safety and Health Association)

Factors Affecting Rolling Stock Design The technical factors which are considered while designing rolling stock are: 

Weight of rolling stock

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Dimensions of rolling stock

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Design of Wheels

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Vehicle brakes

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Traction control

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Coupling Mechanism

1.Weight The Rolling stock weight is designed according to Concessionaire's Proposal. For weight calculations, passenger weight shall be assumed to be 165 lbs/person. Car weights shall be classified as follows: 

AW0 Empty Car operating weight;

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AW1 AW0 weight plus full seated passenger load and train crew;

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AW2 structural mean fatigue load, propulsion and dynamic braking

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performance load);

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AW3 friction braking performance load); and

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AW4 (structural design load, not contemplated for revenue operation)

2. Dimensions of Rolling stock 

Dimensions of rolling stock is also a most important factor kept in mind while designing the rolling stock.

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The dimensions of rolling stock depend on the type of gauge of the railway track.

3. Design of Wheels Design of wheels includes two parameters: 

Size of wheels

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Arrangement of wheels

3. Design of Wheels (continued) Size of Wheels: There are two types of wheels: 

Idle wheels (They only distribute the weight)

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Driving wheels ( They are directly connected to piston)

Arrangement of Wheels: The rolling stock wheels are numbered as X-Y-Z. X=No. of idle wheels in-front of driving wheels Y= No. of driving wheels

Z=No. of idle wheels after driving wheels

4. Braking System The rolling stock brakes can be classified as: 

Hand Brakes (Used to slow down locomotive or stop in slow speed)

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Steam Brakes(Used to slow down locomotive or stop in slow speed)

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Continuous Brakes ( Used to stop the locomotive at high speed)

5. Traction Control Traction: Traction is the power mechanism of the locomotive. It can be of following types: 

Diesel traction

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Steam traction

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Electric traction

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Diesel-electric traction

6. Coupling Mechanism A coupling or coupler is a mechanism for connecting rolling stock in a train. There are following types of couplers: 

Buffer and chain coupler

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Janney coupler

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Meatchopper

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Automatic couplers

Buffer and chain coupler

Janney Coupler

Meat-Chopper

Operational Parameters The operational parameters which are considered while designing rolling stock are following: 

Noise

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Vibrations

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Electromagnetic Compatibility

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Thermal Insulation

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Acoustic Insulation

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Passenger Seat

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Doors and windows

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Luggage Storage

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Heat Ventilation and Air Conditioning

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Lightening system

Operation Parameters 

System Architecture

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Communication System

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Interior and exterior styling

Conclusion 

In conclusion, I want to say that rolling stock design plays a vital role in railway engineering.