FRA Updates Rules for AC Locomotive Wheel Sizes
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The Federal Railroad Administration is updating its safety regulations regarding locomotive wheels. Specifically, the rule increases the maximum allowed difference in diameter between the two wheels on a single axle for locomotives that use alternating current (AC) traction motors.
Why it matters: This is a technical adjustment that allows railroads to keep locomotives in service longer without needing to re-machine or replace wheels as frequently. It streamlines maintenance for fleets using modern AC technology, though it does not change safety standards for older DC locomotives or general passenger rail operations.
Who it affects
- Class I railroads operating fleets with AC traction motors
This rule was issued by the Federal Railroad Administration and published in the Federal Register; readers should consult the official document for specific numerical limits and effective dates.
Agency: Transportation Department, Federal Railroad Administration
Source: Federal Register — read the official document