Track Realignment by the “Hallade” Method
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.
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
- Have 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 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 making 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
Ten days, consisting of two continuous five day modules, Monday – Friday.
There are no particular educational or competence pre-requisites for the course. However, the following factors will benefit the delegates:-
- Prior technical experience of working on the maintenance/ renewal of the track
- Good numeric skills
- Prior basic skills in surveying and use of equipment
Personal Protective Equipment
This course requires the delegate to be on or near the running line and therefore, he/she 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 to BS EN 166 and of Optical Class 1 with Impact Resistance F
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.
The delegate is required to complete an examination to demonstrate his/her ability to complete a survey and design scheme using the “Hallade” Method.
Re-certification is not required.