49 C.F.R. § 230.88 Throttles.
Title 49 - Transportation
Throttles shall be maintained in safe and suitable condition for service, and efficient means shall be provided to hold the throttle lever in any desired position.
Title 49: Transportation
PART 230—STEAM LOCOMOTIVE INSPECTION AND MAINTENANCE STANDARDS
Subpart C—Steam Locomotives and Tenders
Throttles and Reversing Gear
§ 230.88 Throttles.