49 C.F.R. § 236.753 Limits, interlocking.
Title 49 - Transportation
The tracks between the opposing home signals of an interlocking.
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 G—Definitions
§ 236.753 Limits, interlocking.