Rail, Transit & Rolling Stock Manufacturing worked example

Transit Fleet Spares Forecast at 65% spares line uptime: a worked example

This worked example runs the transit fleet spares forecast numbers for a tougher week than the baseline: 65% spares line uptime instead of the typical 90%. Estimate transit fleet spares forecast for rail, transit and rolling stock manufacturing using production-ready inputs so teams can confirm whether capacity can cover demand before committing the schedule.

The inputs for this scenario

  • Spare units produced per production cycle: 4 units / cycle (held at the documented default)
  • Spares production cycles available: 480 cycles (held at the documented default)
  • Spares line uptime: 65 % (the input this scenario stresses; the baseline uses 90)
  • First-pass yield on spare parts: 97 % (held at the documented default)

Working through the calculation

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

How this compares with the baseline

  • Against the tool's baseline example, where spares line 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.
  • Use it when planning a spares production run against fleet demand or a stocking agreement, or when a spares backlog is putting vehicle availability at risk. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Good transit fleet spares forecast capacity: 1,211 units (headline result)
  • Gross transit fleet spares forecast capacity: 1,920 units
  • Transit fleet spares forecast downtime loss: 672 units
  • Transit fleet spares forecast yield loss: 37.44 units

Run it with your numbers

  • To rerun this with your own numbers, open the live Transit Fleet Spares Forecast calculator, set spares line uptime to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.