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Route Relay Interlocking Testing (3BI)

Signalling Testing Courses

Duration 10 Days
Location Derby or Any location subject to equipment requirements
Delegates Maximum 6
Location Places Date Book
LocationDerby Places5 Date11/07/22 BookClick Here

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This course is intended for the signal works tester who requires to perform functional testing on Route Relay Interlockings.

Key Features

The route relay interlocking technology is the universal basis of all interlocking principles and control tables, such that this course is valuable even if the delegate is not intending to work on RRI technology
Closely links the standard circuits to signalling principles and control tables
Completely updated to reflect current requirements
Relay names and technical jargon are explained in “plain english” terminology
Delegates will benefit from practice on our working Route Relay Interlocking

Course Outcomes

On successful completion of this course, the delegate will be able to describe the function of, perform functional testing upon, and diagnose faults within the following classes of circuitry.

  • Push Button Interlocking
  • Route Interlocking
  • Points Interlocking and interfaces
  • Sectional Route Locking
  • Signal Controls
  • Route Normalisation
  • Indications

Assessment and Certification

Achievement of the Course Outcomes will be assessed by a theory assessment of circuit principles and a practical assessment of circuit testing technique.

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.


A well prepared delegate is expected to be experienced Module 3BL Functional Testers who have passed the Intermediate Signalling Technology course. The delegate should be able to interpret signalling layout plans and circuit diagrams and have approximately two years’ practical experience.

Practical Information

Duration: 10 Days including assessment

Location: at our Derby training centre, or on your premises (subject to equipment availability)

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