Rail Signaling & Wayside Equipment worked example

Relay Test Capacity at 65% expected test bench uptime: a worked example

Suppose expected test bench uptime falls to 65%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate relay test capacity for rail signaling and wayside equipment using production-ready inputs so teams can confirm whether capacity can cover demand before committing the schedule.

The inputs for this scenario

  • Relays tested per test cycle: 4 units / cycle (held at the documented default)
  • Available test cycles in the period: 480 cycles (held at the documented default)
  • Expected test bench uptime: 65 % (the input this scenario stresses; the baseline uses 90)
  • Expected relay first-pass yield: 97 % (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Gross relay test capacity = relay test capacity output per cycle × available relay test capacity cycles.
  • Good relay test capacity works out to 1,211 units at these inputs, and this is the headline figure for the scenario.
  • Gross relay test capacity works out to 1,920 units at these inputs.
  • Relay test capacity downtime loss works out to 672 units at these inputs.
  • Relay test capacity yield loss works out to 37.44 units at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where expected test bench uptime sits at 90% and the headline result is 1,676 units, this scenario comes in 27.78% below the baseline at 1,211 units.
  • It multiplies output per cycle by available cycles for gross capacity, then applies uptime and first-pass yield to get good, deliverable capacity. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Good relay test capacity: 1,211 units (headline result)
  • Gross relay test capacity: 1,920 units
  • Relay test capacity downtime loss: 672 units
  • Relay test capacity yield loss: 37.44 units

Run it with your numbers

  • To rerun this with your own numbers, open the live Relay Test Capacity calculator, set expected test bench uptime to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.