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Mentioned 1× · first seen 06-sep-2026 · last seen 06-sep-2026

FRA Locomotive Wheel Set Diameter Variation

Current understanding

To be populated as evidence accumulates.

Evidence log

2026-08-31 — Expanding Certain Locomotive Wheel Set Diameter Variations: FRA final rule expands the allowable wheel diameter variation on the same wheel set for AC-traction locomotives, citing modern traction-motor controls that compensate for the mismatch without the prior safety limit. (novelty: 2)

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Contributing findings

Executive final rule

Expanding Certain Locomotive Wheel Set Diameter Variations

31-aug-2026 novelty 2 per-area 2 introduces

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