Metro Coaches Designing for Excellence

✍ Scribed by K. B. L. Wadhwa

• Publisher: Delhi Metro Rail Corporation
• Year: 2021
• Tongue: English
• Leaves: 156
• Category: Library

✦ Synopsis

Each Metro Project is different & unique in itself and therefore, needs careful attention
of the designer to produce an Optimally Designed Coach. The usual approach of
coach supplier to offer a standard coach from his stable does not work, as it may
lead to inefficient coach being accepted which may, in turn, lead to excessive forces
causing extra wear & tear of wheels & rails, extra energy consumption, improper
curving etc. The common thinking on the part of coach supplier that “ONE SIZE
FITS ALL” does not hold good in case of Metro Projects. The Engineer needs to have
an idea about number & sharpness of curves, gradients, length of transition curves,
track twist & track tolerances etc. of the new project before taking up the Design /
design verification work. The author has, therefore, added 3 separate chapters on
track to enable the Engineer to understand the importance of track parameters on the
performance of the coach.
Author delivered 32 lectures on Mechanical Design of Metro Coaches to the newly
recruited graduate engineers as well as serving senior engineers of DMRC Rolling
Stock wing between Jan. 2019 to Feb. 2020. Further delivery of lectures in person
was interrupted due to COVID19. The author, therefore, prepared remaining lectures
from home & sent them to DMRC. All these lectures, which cover a complete
spectrum of Mechanical Design of Metro Coaches are now being published in the
form of a book for the benefit of existing & future engineers entrusted with the task
of Designing & Design Verification of Metro Coaches in India & Abroad.
These lectures can impart a complete & comprehensive technical knowledge about
Mechanical Aspects of Metro Coach Design for any future Metro Project.
All relevant formulae applicable to various elements of coach suspension system
on the overall performance of the coach have been included in each chapter. It
would enable the Engineer to understand the effect of any parameter change on
the performance of the coach. In case, the reader is interested in understanding
various suspension systems, he may refer to author’s book “Suspension Systems for
Passenger Coaches”, available on “GOOGLE”.
The author can be reached at [phone] for any clarification on the subject.

✦ Table of Contents

Chapter 1 Safety, Stability And Curvability For 6-12
Passenger Coaches
Chapter 2 Vehicle Dynamics 13-24
Chapter 3 Optimizing Bogie Design To Suit Sharp Curves 25-34
Chapter 4 Effect Of Wheel Tread Profile On Curving 35-39
Behaviour And Selection Of Optimal Wheel
Tread Profile
Chapter 5 Suspension System For Coaching Stock 40-53
Chapter 6 Rail Wheel Interaction 54-58
Chapter 7 Design Of Bogie Frame 59-63
Chapter 8 Finite Element Method (FEM) 64-70
Chapter 9 Bogie Frame Testing (Structural Strength Tests) 71-79
For RS10 Stock
Chapter 10 Design Of Wheels And Axles 80-101
Chapter 11 Material Used For Wheels Of Rolling Stock 102-105
And Wheel Tread Damage
Chapter 12 Wheel Defects And Repair Guidance 106-120
Chapter 13 Use Of Aluminum Alloys For Railway Coaches 121-126
Chapter 14 Brakes, Calculating Braking Distance And 127-136
Brake Blocks
Chapter 15 Effect Of Gauge Widening On Curving 137-138
Behavior, Wheel And Rail Wear And
Safety Against Derailment
Chapter 16 Track Geometry And Track Tolerances 139-146
Chapter 17 Forces On A Curve, Transition Curve, 147-151
Balancing Speed, Safe Speed and Cant Deficiency