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T72 and VCC Chair Lock Installation and Maintenance

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
At client's premises only (subject to suitable practical equipment)
Maximum number of delegates: 


By the end of the course delegates will be capable of

  • Identifying the key components of a VCC
  • Identifying the Key components of a T72 Points system

Course Outcomes

  • Describe the manner that the VCC drives the rails, locks/clamps the switch rail to the stock rail, and wedges the open switch away from the stock rail.
  • The delegate will be able to state the mechanical operation of the VCC
  • Describe the reason for shallow depth switches
  • State the importance of the correct setting of adjustable stretcher length
  • Demonstrate the ability to correlate the permanent way to the diagrams
  • Demonstrate the correct method of securing the adjustable stretchers
  • Correctly install the lock body and Lock Arm
  • Correctly fit and cut to length a detector rod (brass plunger)
  • Correctly Pack the lock arm and adjust the Coupling rod to suit
  • Demonstrate how to install the point motor
  • Correctly  install and adjust the drive rod
  • To state the reasons for correct setting of the supplementary detection
  • Correctly tighten all nuts to the required torque settings as determined by standards
  • Demonstrate ability to correctly fit split pins to castellated nuts where required.
  • State how electrical detection works in the ACC interlocking area for a T72 Point Installation.
  • Practically demonstrate how to carry out maintenance operations on the T72 Point Installation.

Assessment and Certification

Achievement of the Course Outcomes will be assessed by a practical assessment.

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 able to have a basic background in Signal Engineering.