• Oct 14, 2025 classic railroad signals semaphores searchlights a ent signals: Horizontal arm: typically indicates 'Stop' or 'Danger.' Diagonal or inclined arm: signals 'Proceed with caution' or 'Limited clearance.' Vertical or upright arm: means 'Clear' or 'Proceed.' These arms are usually painted with distinctive colors—commonly red, yellow, or black—to e By Jenna Bednar
