The London Underground and Docklands Light Railway (DLR) networks contain tight transitions with small radii curves and severe cant gradients. Such extreme track geometry has resulted in exceptionally tight or Foul clearances to existing passenger stock.
An accurate methodology was required for including the effects of transitional track geometry into gauging calculations, which would usually be overlooked on mainline railway due to the absence of such sharp transitions. The aim was to understand exact locations where clearances are tight which would help to define a new vehicle gauge compatible with the infrastructure.
DGauge developed a new approach to gauging assessment, suitable for the transitional track found on the DLR network. By calculating effective vehicle static cant based upon the instantaneous position of individual bogies, cant differentials along the length of the vehicle could now be included within gauging calculations.
Developed to satisfy specific client needs, this never-before-used methodology paved the way for the most precise gauging assessment performed on DLR infrastructure to date. Assessment utilising the new methodology was able to identify specific tight clearance locations, enabling an informed decision on the profile of a vehicle gauge for future stock manufactured for the network.