Okla. Stat. tit. 40, § 40-181: Repairing of steam boilers unlawful, when

It shall be unlawful and deemed a Class D3 felony offense for

any railroad, company or any other person, firm, or corporation,

using steam boilers, to command, order or permit by themselves or

their agents, any of their employees to enter any steam boiler,

firebox or smoke chamber thereto, for the purpose of repairing or

cleaning the same or for any other purpose when the same is under

steam pressure.