Red Zone Working Risk Assessments

Network Rail had to document the new sighting hazards caused by the introduction of the 125mph tilting trains to the West Coast Main Line and determine what restrictions needed adding to the National Hazard Directory. Initial assessments to this end were not standardised and the existing sighting distance measurement technique produced inconsistent results.

What can RSK do?

We can initiate a robust and auditable assessment method that calculates actual sighting distances for any proposed line-speed increase on any section of the network.

How does it work?

Following a risk assessment using COSS and Lookout staff, the sighting distance is measured with a Bushnell Yardage Pro 1000 Range Finder to determine the start and end point of each sighting hazard.

Where the infrastructure allows, the distance between fixed structures such as bridges and mile markers is measured (figure 1). Each section continues until a Red Zone Prohibited (RZP) area is reached, after which a new section begins. Photographs of viewpoints positioned in the north and south are taken at each point. In some instances, provided there is sufficient clearance, it may be possible to replace an existing Red Zone working prohibition area with a sighting hazard, thereby enabling work to be carried out using assisted lookouts.

Innovative data management

Collated data is inputted into a specially designed spreadsheet that contains the measured distances (derived from site, intermediate and distant lookouts), current and proposed line speeds, and the required sighting distances (figures 2 and 3), giving an instant, at-a-glance overview of the areas where sighting cannot be achieved. The spreadsheet’s user-friendly features include an option to view single sections or all sections at once (figures 2 and 3). Once a hazard has been identified, its start and end point is calculated (see figure 4). Areas deemed to be “borderline” are discussed with Network Rail Safety Managers and, if necessary, an additional assessment is initiated between mile markers (at half mile sections) to see if sighting can be achieved at certain locations. Once all issues have been resolved, RSK Rail Services issues a comprehensive report with appropriate recommendations and the Hazard Directory is updated accordingly. Post-completion, assistance is available to help safety managers make any future amendments to the National Hazard Directory.

Peerless experience

RSK Rail Services risk assessors have four years’ experience of undertaking Red Zone Working Risk Assessments, which has encompassed the network between Euston and Carstairs.

Brochure