Rail Signaling & Wayside Equipment worked example

Environmental Test Capacity at 99% expected chamber uptime: a worked example

Push expected chamber uptime up to 99% and the picture changes. This example computes every intermediate figure at that operating point. Use it when environmental test capacity in rail signaling and wayside equipment is being asked to take on more work and you need to know if there is room.

The inputs for this scenario

  • Enclosures tested per chamber cycle: 4 units / cycle (unchanged)
  • Available chamber cycles: 480 cycles (unchanged)
  • Expected chamber uptime: 99 % (raised for this scenario; the documented default is 90)
  • Expected environmental test first-pass yield: 97 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross environmental test capacity = environmental test capacity output per cycle × available environmental test capacity cycles) to the inputs above produces each figure below.
  • At this operating point the engine returns 1,844 units for good environmental test capacity, the number this scenario is built around.
  • At this operating point the engine returns 1,920 units for gross environmental test capacity.
  • At this operating point the engine returns 19.2 units for environmental test capacity downtime loss.
  • At this operating point the engine returns 57.02 units for environmental test capacity yield loss.

How this compares with the baseline

  • Against the tool's baseline example, where expected chamber uptime sits at 90% and the headline result is 1,676 units, this scenario comes in 10% above the baseline at 1,844 units.
  • It computes gross environmental test capacity from output per cycle and available cycles, then nets out chamber uptime and first-pass yield to give the number of good, qualified units. 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

  • Good environmental test capacity: 1,844 units (headline result)
  • Gross environmental test capacity: 1,920 units
  • Environmental test capacity downtime loss: 19.2 units
  • Environmental test capacity yield loss: 57.02 units

Run it with your numbers

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

Last reviewed 2026-05-12.