49 C.F.R. § 230.101 Steam locomotive driving journal boxes.
Title 49 - Transportation
(a) Driving journal boxes. Driving journal boxes shall be maintained in a safe and suitable condition for service. Not more than one shim may be used between the box and bearing. (b) Broken bearings. Broken bearings shall be renewed. (c) Loose bearings. Loose bearings shall be repaired or renewed.
Title 49: Transportation
PART 230—STEAM LOCOMOTIVE INSPECTION AND MAINTENANCE STANDARDS
Subpart C—Steam Locomotives and Tenders
Running Gear
§ 230.101 Steam locomotive driving journal boxes.