49 C.F.R. § 214.518 Safe and secure positions for riders.
Title 49 - Transportation
On or after March 1, 2004, a roadway worker, other than the machine operator, is prohibited from riding on any on-track roadway maintenance machine unless a safe and secure position for each roadway worker on the machine is clearly identified by stenciling, marking, or other written notice. [69 FR 8839, Feb. 26, 2004]
Title 49: Transportation
PART 214—RAILROAD WORKPLACE SAFETY
Subpart D—On-Track Roadway Maintenance Machines and Hi-Rail Vehicles
§ 214.518 Safe and secure positions for riders.