49 C.F.R. § 236.710 Block, latch.
Title 49 - Transportation
The lower extremity of a latch rod which engages with a square shoulder of the segment or quadrant to hold the lever in position.
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
§ 236.710 Block, latch.