System | Variable |
Geometry system | Left/right elevation, gauge, left/right track alignment, level, warp, change rate of curvature, track quality indicators, change rate of track quality variables |
Rail system | Spalling and chipping, flow of rail head or working edge, rail joint malocclusion on the top or inner side, rail vertical wear, rail side wear, scaling, rail head transverse damage, abnormal light band, screw hole transverse crack |
Connecting part system | Fastener missing, fastener skewed, fastener buried; rubber gasket skewed |
Sleeper system | Sleeper deflection, sleeper chipping, sleeper crack, number of sleepers, sleeper spacing |
Subgrade ballast system | Thickness, ballast bed smudgy, ballast bed smudging |
Operating system | Total mass of passing trains |