# The Railways and Other Guided Transport Systems (Safety) Regulations 2006, Paragraph 17: Values for CSTs


The following table sets out the values for the CSTs.
Risk category
CST value (x 10-6)
Measurement units
Risk to passengers
CST. 1.1
0.17
Number of passenger FWSIs per year arising from significant accidents/Number of passenger train-km per year
CST 1.2
0.00165
Number of passenger FWSIs per year arising from significant accidents/Number of passenger-km per year
Risks to staff or employees, including the staff of contractors
CST 2
0.0779
Number of employee FWSIs per year arising from significant accidents/Number of train-km per year
Risk to level crossing users
CST 3.1
0.710
Number of level-crossing user FWSIs per year arising from significant accidents/Number of train-km per year
CST 3.2
n/a
Number of level-crossing user FWSIs per year arising from significant accidents/[(Number of Train-km per year x Number of level crossings)/Track-km)]
Risk to others
CST 4
0.0145
Yearly number of FWSIs to persons belonging to the category ‘others’ arising from significant accidents/Number of train-km per year
Risk to unauthorised persons on railway premises
CST 5
2.05
Number of FWSIs to unauthorised persons on railway premises per year arising from significant accidents/Number of train-km per year
Risk to society as a whole
CST 6
2.59
Total number of FWSIs per year arising from significant accidents/Number of train-km per year

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Source: https://www.legislation.gov.uk/uksi/2006/599/schedule/11/paragraph/17 (the official version)
Page: https://openlegislation.uk/railways-and-other-guided-transport-systems-safety-regulations-2006/schedule-11/paragraph-17
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.