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DOT/FRA RIN: 2130-AD50 Publication ID: Spring 2025 
Title: ●Expanding Certain Locomotive Wheel Diameter Variations 
Abstract:

FRA proposes to amend its locomotive safety regulations to expand the maximum permitted variation in diameter for locomotive wheel sets using alternating current technology, in response to a Class I railroad’s May 2019 petition for rulemaking and innovations in traction motor control. 

 
Agency: Department of Transportation(DOT)  Priority: Substantive, Nonsignificant 
RIN Status: First time published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: No  Unfunded Mandates: No 
EO 14192 Designation: Deregulatory 
CFR Citation: 49 CFR part 229     (To search for a specific CFR, visit the Code of Federal Regulations.)
Legal Authority: 49 U.S.C. 20103, 20107, 20133, 20137–38, 20143, 20168, 20701–03, 21301–02, 21304    28 U.S.C. 2461 note    and 49 CFR 1.89.   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  07/01/2025  90 FR 28658   
NPRM Comment Period End  09/02/2025 
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Amanda Maizel
Attorney Adviser
Department of Transportation
Federal Railroad Administration
1200 New Jersey Avenue SE,
Washington, DC 20590
Phone:202 308-3753
Email: amanda.maizel@dot.gov