Rule 439

OPTIONAL: Unless required to clear a switch, crossing, controlled location, or spotting passenger equipment on station platforms, a movement not authorized by Rule 564 must stop at least 300 feet in advance of the STOP signal.

Stop - Stop. 1. A high mast, single aspect signal displaying red with an ‘A’ plate on the mast. 2. A high mast, inline, double aspect signal displaying red on the top, red on the bottom. 3. A high mast, inline, triple aspect signal displaying red on the top, red in the middle, red on the bottom. 4. A double aspect, dwarf signal displaying red on the top, red on the bottom. 5. A single aspect dwarf signal displaying red.