C.F.R. » Title 49 » CHAPTER II—FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION › PART 230—STEAM LOCOMOTIVE INSPECTION AND MAINTENANCE STANDARDS › Subpart B—Boilers and Appurtenances

49 C.F.R. § 230.35

Pressure testing

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The temperature of the steam locomotive boiler shall be raised to at least 70 deg. F any time hydrostatic pressure is applied to the boiler.