Bombardier plan to run the Class 730 vehicle on various routes across the Northwest and Midlands. Prior to running the vehicle, Bombardier and Network Rail must satisfy the requirements of the current standards pertaining to the introduction of new rolling stock on a route. Part of the process was to determine that the clearance between the vehicle and structures on the route meet current standards. If clearance is less than that required, work, either by physical or risk assessment, must be completed.
A GRIP 2 gauging assessment was undertaken by Network Rail for the Class 730 vehicle across the relevant routes using the National Gauging Database (NGD). This identified a number of sites that currently provide sub-standard clearances to the vehicle. InoRail Ltd were commissioned to investigate these locations in detail, determine their existing kinematic clearance, and propose options to obtain compliant clearances.
The general scope of the project was to undertake site surveys from which up to date clearance analysis will be undertaken. Where clearance non-compliances existed the scope was to develop design solutions, to detailed design, that will provide sufficient clearance to the Class 730 vehicle. This included Track (Form-A/B) and Civil Engineering (Form 001/002/003) submissions
A total of twenty-two sites were included within the programme of works, which was delivered through the following stages;