Rule 421

Signal aspect: Limited to Stop

Indication: Proceed, LIMITED speed passing signal and through turnouts, preparing to stop at next signal.

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