scope:

This specification:

a) sets out requirements for the project manager and engineer to specify signalling survey work, by identifying key stages to deliver good quality work for current and future needs.

b) specifies the provision of Signalling asset data for use when changes to the location or arrangement of the trackside signalling assets or renewals of the Signalling system are to be undertaken. Information management using BIM should be utilised even if not mandated on particular projects.

It supports NR/L2/TRK/3100, particularly in the need to set out a Project Survey Strategy.

It covers the development, design, construction, testing and commissioning of Signalling assets on the Network Rail infrastructure. Access to the data is via existing data repositories where the validity of the data is known. Where the validity is uncertain, the survey methodologies specified in this standard apply. 

This specification includes the collection of data from existing, non-video, sources and applies only to topographic surveys associated with the introduction or relocation of trackside signalling assets, since correlation of wiring, etc. and other surveys are covered by other processes and standards. The scope may include the creation of new data from several sources that may include a topographic survey but not in every case.

Structure gauge is covered by NR/L2/TRK/3203 and NR/L3/SIG/10064, module NR/GI/C001. 

The ongoing configuration management of the "as-is" Signalling asset data is outside of the scope of this standard. 

Purpose 

This specification lowers the risks associated with poor survey work, including the risk to staff of increased on-site ballast surveys, the risk of staff failing to attend the right location to work on equipment and the risk of misalignment across multi-disciplinary surveys. 

The principle "Survey once and use many times" provides better value for the money spent by avoiding re-work, duplication of survey work, and misalignment of cross disciplinary surveys. 

The standard aligns signalling surveys with NR/L1/ADG/004, NR/L2/TRK/3100 and BIM.