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Track Realignment by the “Hallade” Method

Course Aims

This course is intended to provide a delegate with an in-depth knowledge in the surveying, calculation and design of track re-alignment schemes when using the “Hallade" method.


8 days

Learning Objectives

At the end of this course the delegates will: -
• Have a clear understanding of track geometry and track parameters, speed, curve, gradient etc
• Be able to demonstrate a clear understanding of the principles of the “Hallade” survey, including the use of relevant surveying equipment
• Be able to demonstrate an understanding of the theory of overlapping chords
• Be able to demonstrate an understanding of design requirements and the relevant tolerances
• Understand the quarter chord theory
• Understand the transition theory – cubic parabola
• Have an clear understanding of the tangential changes of radius relating to the curvature of the track
• Be able to demonstrate a clear understanding of the method of employing couples
• Understand the relationship between a theodolite straight and Hallade curve
• Be aware of the requirements for marking the track for on-track machines
• Be aware of Railway Group Standards, Network Rail Company Standards and D.O.T. requirements relating to track re-alignment schemes

Pre Requisite Requirements

The following pre-requisites are required for this course:-
• Prior technical experience of working on the maintenance/ renewal of the track
• Good mathematical skills
• Prior basic skills in surveying and use of surveying equipment
• To assist the delegate in the high level of design calculations required on the course it is recommended that each attending delegate be in possession of a laptop computer.

PPE Requirements

This course requires the delegate to be on or near the running line and therefore, they MUST be in possession of:-
• Valid P. T. S. Card
• Protective “all orange” High Visibility Clothing to BS EN 471:2003
• Safety Footwear to BS EN ISO 20345:2004
• Safety Helmet (white/blue) to BS EN 397:1995
• General Purpose Gloves to BS EN388:2121
• Safety Glasses BS EN 166 and of Optical Class 1 with Impact Resistance F


A Certificate of Training will be awarded to the delegate on successful completion of this course. Certification has no expiry.