49 C.F.R. § 236.1 Plans, where kept.
Title 49 - Transportation
As required for maintenance, plans shall be kept at all interlockings, automatic signals and controlled points. Plans shall be legible and correct. [49 FR 3382, Jan. 26, 1984]
Title 49: Transportation
PART 236—RULES, STANDARDS, AND INSTRUCTIONS GOVERNING THE INSTALLATION, INSPECTION, MAINTENANCE, AND REPAIR OF SIGNAL AND TRAIN CONTROL SYSTEMS, DEVICES, AND APPLIANCES
Subpart A—Rules and Instructions: All Systems
General
§ 236.1 Plans, where kept.