# The Railways and Other Guided Transport Systems (Safety) Regulations 2006, Paragraph 2: Interpretation


In this Schedule—
“fatalities and weighted serious injuries” (“FWSIs”) means a measurement of the consequences of significant accidents combining fatalities and serious injuries, where 1 serious injury is considered statistically equivalent to 0.1 fatalities;
“level crossing users” means all persons using a level crossing to cross a railway line by any means of transportation or by foot;
“national reference value” (“NRV”) means a reference measure indicating the maximum tolerable level for a railway risk category;
“others” means all persons who are not passengers, staff or employees including the staff of contractors, level crossing users or unauthorised persons on railway premises;
“passenger-km” means the unit of measure representing the transport of one passenger by rail over a distance of one kilometre;
“passenger train-km” means the unit of measure representing the movement of a passenger train over one kilometre;
“risk category” means one of the railway risk categories specified by Article 7(4)(a) and (b) of the Directive;
“risk to society as a whole” means the collective risk to all categories of persons listed in Article 7(4)(a) of the Directive;
“safety enhancement plan” means a plan to implement the organisational structure, responsibilities, procedures, activities, capabilities and resources required to reduce the risk for one or more risk categories;
“staff or employees including the staff of contractors” means any persons whose employment is in connection with a railway and is at work at the moment of the accident; it includes the crew of the train and persons handling rolling stock and infrastructure installations;
“track-km” means the length measured in kilometres of the railway network where each track of a multiple track railway line is to be counted;
“train-km” means the unit of measure representing the movement of a train over one kilometre; the distance used is the distance actually run, if available, otherwise the standard network distance between the origin and destination must be used;
“unauthorised persons on railway premises” means any persons present on railway premises where such presence is forbidden, with the exception of level crossing users;

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Source: https://www.legislation.gov.uk/uksi/2006/599/schedule/11/paragraph/2 (the official version)
Page: https://openlegislation.uk/railways-and-other-guided-transport-systems-safety-regulations-2006/schedule-11/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.