Traction and rolling suspension, wheelsets and brakes and associated systems Revision — Excellence, Achievement & Learning Limited Occupational Qualification

    1. Understand the fundamentals of traction and rolling stock suspension and tilt systems;1.1 Differentiate between the different suspension systems fitted to trains in relation to their purpose;1.2 Describe the operation and control of a high speed train tilt system, list potential failure modes and the mitigation that may be applied in the event of failure;1.3 Illustrate mathematically how failed suspension increases damage to both track and vehicles;1.4 Write a planned maintenance programme for a typical high speed train suspension and tilt mechanism;1.5 Compare conventional body/bogie mountings;1.6 Write a winterisation procedure for a high speed train tilt system.2. Understand the fundamentals of traction and rolling stock braking systems;2.1 Describe a typical air/electric brake system;2.2 Compare and contrast tread brake, cheek disc and inboard disc braking systems;2.3 Describe how a variable load valve works and what symptoms would become apparent in the event of failure;2.4 Describe the various types of friction pad in use on main line traction and rolling stock;2.5 Describe with the aid of schematics the operation of a typical wheel slide prevention system;2.6 Describe the safety systems that can take over the operation of a train braking system in the event of operator error;2.7 Describe why automatic sanding is necessary;2.8 Write a planned maintenance programme for a typical high speed train braking system.3. Understand the fundamentals of traction and rolling stock axles, wheels and bearings;3.1 Draw a typical wheelset, identifying all components;3.2 List the different types of wheel profile in common use on the network, identifying typical duties and the rationale for selection;3.3 Write a wheelset and axle bearing maintenance policy;3.4 Describe the process of changing out a wheelsets as routine maintenance, identifying all risks associated with the operation;3.5 Describe in situ test and inspection methodology for traction and rolling stock wheelsets;3.6 Discuss the implications of a ‘flat’ on a wheelset;3.7 Discuss ways in which wheelset life may be extended, listing determining factors;3.8 Describe the criticality of the wheel rail interface and its implications for track wear and damage.

    Exam Tips

    Common Mistakes

    Key Marking Points

    Traction and rolling suspension, wheelsets and brakes and associated systems

    EXCELLENCE-ACHIEVEMENT-AND-LEARNING-LIMITED
    vocational

    Traction and rolling suspension, wheelsets, and brakes are critical systems for train safety and performance. Understanding their operation, maintenance, and failure modes is essential for engineering technicians in the rail industry.

    0
    Learning Outcomes
    3
    Assessment Guidance
    3
    Key Skills
    1
    Key Terms
    5
    Assessment Criteria

    Assessment criteria

    EAL Level 3 Certificate in Engineering Technologies

    Topic Overview

    The EAL Level 3 Certificate in Engineering Technologies is a vocationally-related qualification designed to provide students with the essential knowledge and practical skills required for a career in engineering. This qualification covers a broad range of engineering disciplines, including mechanical, electrical, and electronic engineering, and is recognised by employers and higher education institutions across the UK. It is ideal for students who wish to progress to an apprenticeship, higher education, or directly into the engineering workforce.

    The course is structured around core units that develop fundamental engineering principles, such as health and safety, mathematics for engineering, and engineering materials. Students also study specialist units that allow them to focus on areas like computer-aided design (CAD), electrical and electronic principles, and mechanical systems. The qualification emphasises hands-on learning, with practical assessments that test students' ability to apply theoretical knowledge to real-world engineering problems.

    This qualification is part of the Regulated Qualifications Framework (RQF) and is equivalent to one A-level. It provides a solid foundation for further study, such as the EAL Level 4 Diploma in Engineering or a university degree in engineering. By completing this certificate, students demonstrate their competence in key engineering skills, making them valuable assets to employers in sectors such as manufacturing, automotive, aerospace, and energy.

    Key Concepts

    Core ideas you must understand for this topic

    • →Health and Safety in Engineering: Understanding the Health and Safety at Work Act 1974, risk assessments, and safe working practices in engineering environments.
    • →Engineering Mathematics: Applying algebraic, trigonometric, and statistical methods to solve engineering problems, including calculations for forces, moments, and electrical circuits.
    • →Engineering Materials: Classifying materials (metals, polymers, ceramics, composites) and understanding their properties, such as tensile strength, hardness, and conductivity, and how these influence material selection.
    • →Electrical and Electronic Principles: Grasping Ohm's law, Kirchhoff's laws, and the behaviour of components like resistors, capacitors, and transistors in circuits.
    • →Computer-Aided Design (CAD): Using CAD software to create 2D and 3D engineering drawings, including dimensioning, tolerancing, and assembly modelling.

    What You Need to Demonstrate

    Key skills and knowledge for this topic

    • Differentiate between primary and secondary suspension systems.
    • Describe the operation of a wheel slide prevention system.
    • Explain the consequences of a flat on a wheelset.
    • Write a planned maintenance programme for braking systems.
    • Identify risks associated with wheelset change-out.

    Assessment Criteria

    Key criteria assessors look for in your portfolio

    • Differentiate between primary and secondary suspension systems.
    • Describe the operation of a wheel slide prevention system.
    • Explain the consequences of a flat on a wheelset.
    • Write a planned maintenance programme for braking systems.
    • Identify risks associated with wheelset change-out.

    Assessment Guidance

    Guidance for achieving higher grades

    • 💡Use diagrams to explain system operations.
    • 💡Link theory to real-world maintenance practices.
    • 💡Understand mathematical relationships in suspension dynamics.
    • 💡Always show your working in calculations. Even if the final answer is wrong, you can gain marks for correct method and intermediate steps.
    • 💡When answering questions about materials, link properties to applications. For example, explain why aluminium is used in aircraft due to its low density and high strength-to-weight ratio.
    • 💡In practical assessments, demonstrate safe working practices consistently. Examiners look for correct use of PPE, tidy workspace, and adherence to risk assessments.

    Common Mistakes

    Common errors to avoid in your coursework

    • Confusing tread brake and disc brake systems.
    • Overlooking the importance of wheel-rail interface.
    • Not considering failure modes in maintenance planning.
    • Misconception: Engineering is only about fixing things. Correction: Engineering is a creative and analytical discipline focused on designing, innovating, and improving systems and products, not just maintenance.
    • Misconception: Mathematics is not important for engineering. Correction: Mathematics is fundamental to engineering; it is used to model, analyse, and solve problems in all engineering fields.
    • Misconception: Health and safety is just common sense. Correction: Health and safety in engineering involves specific legal requirements, risk assessment procedures, and industry standards that must be formally applied.

    Frequently Asked Questions

    Common questions students ask about this topic

    Before You Start

    Prior knowledge that will help with this topic

    • •GCSE Mathematics at grade 4 or above, as the course involves significant mathematical problem-solving.
    • •GCSE English at grade 4 or above, to understand technical documentation and write clear reports.
    • •Basic understanding of physics concepts such as force, energy, and electricity is beneficial.

    Key Terminology

    Essential terms to know

    • 1. Understand the fundamentals of traction and rolling stock suspension and tilt systems;1.1 Differentiate between the different suspension systems fitted to trains in relation to their purpose;1.2 Describe the operation and control of a high speed train tilt system, list potential failure modes and the mitigation that may be applied in the event of failure;1.3 Illustrate mathematically how failed suspension increases damage to both track and vehicles;1.4 Write a planned maintenance programme for a typical high speed train suspension and tilt mechanism;1.5 Compare conventional body/bogie mountings;1.6 Write a winterisation procedure for a high speed train tilt system.2. Understand the fundamentals of traction and rolling stock braking systems;2.1 Describe a typical air/electric brake system;2.2 Compare and contrast tread brake, cheek disc and inboard disc braking systems;2.3 Describe how a variable load valve works and what symptoms would become apparent in the event of failure;2.4 Describe the various types of friction pad in use on main line traction and rolling stock;2.5 Describe with the aid of schematics the operation of a typical wheel slide prevention system;2.6 Describe the safety systems that can take over the operation of a train braking system in the event of operator error;2.7 Describe why automatic sanding is necessary;2.8 Write a planned maintenance programme for a typical high speed train braking system.3. Understand the fundamentals of traction and rolling stock axles, wheels and bearings;3.1 Draw a typical wheelset, identifying all components;3.2 List the different types of wheel profile in common use on the network, identifying typical duties and the rationale for selection;3.3 Write a wheelset and axle bearing maintenance policy;3.4 Describe the process of changing out a wheelsets as routine maintenance, identifying all risks associated with the operation;3.5 Describe in situ test and inspection methodology for traction and rolling stock wheelsets;3.6 Discuss the implications of a ‘flat’ on a wheelset;3.7 Discuss ways in which wheelset life may be extended, listing determining factors;3.8 Describe the criticality of the wheel rail interface and its implications for track wear and damage.

    Ready to learn?

    AI-powered learning tailored to this unit

    Related Topics in EXCELLENCE-ACHIEVEMENT-AND-LEARNING-LIMITED vocational Design and Technology

    Additive Manufacturing (3D Printing)

    View Topic

    Additive Manufacturing (3D Printing)

    View Topic

    Advanced Manufacture Techniques – Computer Numerical Control –CNC-

    View Topic

    Advanced Manufacture Techniques – Computer Numerical Control –CNC-

    View Topic