NR NR/L2/SIG/30070 ISSUE 1 PDF

The processes described include verification that a renewal proposal is suitable for application of these procedures and techniques, design techniques and rules, preparatory works both on site and in the assembly factory, signalling support for the installation of the turnout, testing, recovery of redundant circuitry and maintenance.

This standard shall only be applied to specifically authorised trials of the Modular S&C process.

This standard applies to the renewal of a turnout with an NR60 modular unit fitted with Hy-drive operating equipment. It assumes that the works are undertaken using a standard interface location to interface it with the existing RRI or SSI signalling installation. The full list of assumptions that shall be satisfied are detailed in section 5.

This standard applies equally to the renewal of a single turnout or the two halves of a crossover (either in two possessions or in a single possession). Where a crossover is renewed in two separate possessions it shall normally be out of use for crossover moves between possessions but detection maintained.

For the purposes of this standard, the term turnout shall apply equally to half of a crossover except where otherwise specified.

Purpose

This standard details the signalling processes to be followed when planning and implementing a switch and crossing renewal using the pre-fabricated, modular techniques.

The processes support the installation of a replacement turnout using a factory prepared panel transported to site by rail complete with the Hy-drive point operating mechanism already installed and adjusted. The objectives are to maximise the standardisation of the process and design, and to minimise the time to hand back the signalling system following the track renewal.

The objective of the Modular S&C initiative is to achieve the signalling installation and testing once the track unit is handed over in less than 30 minutes.