Rail Signaling & Wayside Equipment worked example

Inspection Bottleneck with inspection severity if the bottleneck fails undetected of 15 score: a worked example in rail signaling & wayside equipment

Push inspection severity if the bottleneck fails undetected up to 15 score and the picture changes. This example computes every intermediate figure at that operating point. Use it when inspection bottleneck in rail signaling and wayside equipment needs a defensible ranking against other rail signaling and wayside equipment risks for the next review.

The inputs for this scenario

  • Inspection severity if the bottleneck fails undetected: 15 score (raised for this scenario; the documented default is 6)
  • Likelihood the inspection bottleneck recurs per cycle: 4 score (unchanged)
  • Ability to detect the bottleneck before dispatch: 3 score (unchanged)

Working through the calculation

  • Applying the documented formula (Inspection bottleneck risk score = inspection bottleneck severity score × inspection bottleneck occurrence score × inspection bottleneck detection score) to the inputs above produces each figure below.
  • At this operating point the engine returns 8.15 score for inspection bottleneck risk score, the number this scenario is built around.
  • At this operating point the engine returns 15 score for inspection bottleneck severity score.
  • At this operating point the engine returns 4 score for inspection bottleneck occurrence score.
  • At this operating point the engine returns 3 score for inspection bottleneck detection score.

How this compares with the baseline

  • Against the tool's baseline example, where inspection severity if the bottleneck fails undetected sits at 6 score and the headline result is 4.55 score, this scenario comes in 79.12% above the baseline at 8.15 score.
  • It multiplies a severity, occurrence and detection score for one inspection bottleneck into a single risk score you can rank against peers. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Inspection bottleneck risk score: 8.15 score (headline result)
  • Inspection bottleneck severity score: 15 score
  • Inspection bottleneck occurrence score: 4 score
  • Inspection bottleneck detection score: 3 score

Run it with your numbers

  • Every input above is editable in the live Inspection Bottleneck calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.