49 C.F.R. § 229.111 Water-flow indicator.
Title 49 - Transportation
(a) Steam generators shall be equipped with an illuminated visual return water-flow indicator. (b) Steam generators shall be equipped with an operable test valve or other means of determining whether the steam generator is filled with water. The fill test valve may not discharge steam or hot water into the steam generator compartment.
Title 49: Transportation
PART 229—RAILROAD LOCOMOTIVE SAFETY STANDARDS
Subpart C—Safety Requirements
Steam Generators
§ 229.111 Water-flow indicator.
