Stadler Rail was awarded a £600m contract in October 2016 to supply 58 Flirt UK sets in regional (Class 755) and inter-city (Class 745) variants into the Greater Anglia Franchise. DGauge were contracted by Stadler Rail to undertake a gauging review of their proposed vehicle design and provided supporting information on gauging issues to the route infrastructure and help refine the vehicle design to meet UK gauging requirements.
The Stadler design featured a novel vehicle design for the UK Railway Network, featuring a long cab nose, units of varying length, differing bogie and pivot coupling arrangements.
DGauge undertook a preliminary investigation to identify gauging issues for the proposed vehicle design against all structures on the Greater Anglia routes. Further investigation was undertaken to compare the swept envelope for the vehicle design against the published RSSB Lower Sector Vehicle Gauge (LSVG) over a comprehensive virtual route of track conditions. Structure gauging Issues were identified for the routes, predominantly against platforms which were not constructed or maintained to be compliant with the Lower Sector Infrastructure Gauge (LSIG).
DGauge provided on going support to Stadler Rail throughout the finalisation of the vehicle design to assess gauging issues upon the routes and provide recommendation for improvement to vehicle design. Individual items of equipment were identified where gauging issues were more prevalent, primarily Intercar Damper and Bogie Suspension components.
Contractually, Stadler were responsible for the cost of engineering work undertaken on Network Rail infrastructure to support vehicle introduction, therefore any improvements to the vehicle design to reduce future engineering work benefiting the project. Through an iterative process the vehicle design was refined to improve (reduce) structure clearances for the routes and minimise the quantity of structures where engineering work would be required prior to route introduction.
DGauge provided support to Stadler Rail for the duration of the project from award of contract to vehicle introduction. Working closely with Network Rail Gauging Engineers for the Greater Anglia region reviewing gauging issues and determining structures where engineering work would be required prior to vehicle introduction.