A representative KHEERAN track geometry engagement — the scope and deliverables a typical campaign provides.
Scope. Continuous measurement of track geometry across a subdivision or network segment: gauge and gauge variation, horizontal alignment, vertical profile, cross-level/superelevation, twist and warp, curvature and superelevation runoff — referenced to your chainage and GPS.
Standards. Geometry is evaluated against the governing track-safety standards — FRA 49 CFR Part 213 in the USA, the Transport Canada Rules Respecting Track Safety, and EN 13848 internationally — with exceptions classified by the resulting Class of Track and flagged where a two-class drop indicates serious non-compliance.
Method. Measurement from a hi-rail vehicle or EN 13848-4 trolley using a chord-based (mid-chord ordinate) or space-curve approach, sampled at fine intervals with mechanical gauge contact that performs in adverse weather and vegetation. A Track Quality Index rates each segment good/average/poor within its class, and run-over-run comparison reveals deterioration rate.
Deliverables. Geometry brush charts with flagged defects, exception and curve-analysis lists (peak value, length, location), KML maps and CSV data, limiting-speed and Class+1 analysis, and — combined with our GPR substructure data — root-cause pairing that distinguishes geometry faults caused by fouled ballast, trapped water or formation from surface-level defects.