New York Codes, Rules and Regulations
Title 17 - DEPARTMENT OF TRANSPORTATION
Chapter VI - Transportation Regulations
Subchapter F - Railroad And Street Railroad Corporations
Article 2 - Safety
Part 922 - Locomotive Boilers And Steam Reservoirs
Section 922.11 - Steam gauges

(a) Location of gauges. Every boiler or steam reservoir shall have at least one steam guage which will correctly indicate the working pressure. Care must be taken to locate the gauge so that it will be kept reasonably cool and can be conveniently read by the engine men.

(b) Siphon. Every gauge shall have a siphon of ample capacity to prevent steam entering the gauge. The pipe connection shall enter the boiler or steam reservoir direct and shall be maintained steam tight between boiler or steam reservoir and gauge. The siphon pipe and its connections to the boiler or steam reservoir must be cleaned each time the gauge is tested.

(c) Time of testing. Steam gauges shall be tested at least once every three months and also when any irregularity is reported.

(d) Method of testing. Steam gauges shall be compared with an accurate test gauge or dead-weight tester, and gauges found inaccurate shall be corrected before being put into service.

(e) Boiler No. The builder's No. of the boiler or steam reservoir, if known, shall be stamped on the dome. If the builder's No. cannot be obtained, an assigned No. which shall be used in making out specification cards shall be stamped on dome.