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Westpac Geographical Interlocking - Mk IIIA - Appreciation

Bespoke & Private Courses: 

Signet Solutions can reserve a course for your company exclusively, and we can design courses to meet your company's specifications. Please contact us to discuss your requirements.

5 Days
Derby or at your premises by arrangement
Maximum number of delegates: 


This course is intended for staff to gain a basic knowledge of this type of interlocking.

Key Features

• Basic understanding of the system.
• Overview of the processes.
• Overview of the relay names and functions.

Course Outcomes

On successful completion of this course, the delegate will be able to demonstrate an understanding of the following:

• Principles of Geographical Circuitry
• System Construction and Wiring
• Levels of route
• Selection
• Calling
• Locking
• Aspects
• Releasing
• Panel Indications

Assessment and Certification

Achievement of the Course Outcomes will be assessed by a short theory assessment to demonstrate the underpinning knowledge gained.

The delegate’s achievement of the Course Outcomes will be confirmed by a certificate which will be forwarded to the nominated client contact following the course.


It would be helpful if delegate have some prior knowledge of general signalling principles and circuitry.