Course Aims

This course is intended to provide a delegate with the understanding to carry out the duties of a Controller of Site Safety.

Learning Objectives

At the end of this course the delegates will: –

  • Have the ability to understand the railway environment and track terminology
  • Be able to demonstrate a clear understanding of all relevant safety procedures
  • Be able to demonstrate the communication skills required by a COSS
  • Be able to carry out a concise and accurate safety brief
  • Be able to undertake the emergency procedures resulting from an emergency affecting the safety of trains
  • Be able to demonstrate the setting up of a safe system of work
  • Be able to demonstrate a clear understanding of SSOW hierarchy including open or blocked lines
  • Be able to demonstrate a clear understanding in the use of the Sectional Appendix, relevant sections of the Rule Book, Network Rail Hazard Directory and SSOW PLAN
  • Be able to complete all relevant documentation
  • Understand Line Clear Verification

Course Duration

Five days, including the assessment process.


Delegates MUST be in possession of:

  • Valid P.T.S. Certificate
  • Current Rule Book and Handbooks 1, 2, 3, 6, 7, 8, 9, 10, 13, 16, 17
  • Completed Pre-COSS Workbook registered on Sentinel

Personal Protective Equipment

This course requires the delegate to be on or near the running line, therefore, he/she MUST be in possession of: –

  • A Valid Sentinel 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


This competency is valid for two years. A Network Rail Sentinel card (endorsed with probationary status COSS(P)) will be awarded to each successful candidate. The sponsor must ensure a minimum of two further work place assessments take place within four months of the course date (observation by a mentor and workplace assessment by a registered assessor).


Post course objectives and COSS Log Book will be issued to the delegate on completion of the course. Note: Any delegate who is required to work safely near or adjacent to DC conductor rails will have to attend the DC Conductor Rail course which is a separate standalone module.