Semaphore signals

Semaphore signals

The front face of a semaphore running signal arm is red, with a transverse (across the arm) white stripe. The back face is white with a transverse black stripe.

The signal arm of fixed STOP semaphore signals may be reflective.

Semaphore signals that can be cleared have arms with red and green glass panels that are lit from behind at night.

Lower quadrant semaphore signals

Lower quadrant semaphore running signals have large arms to control main line movements.

Lower quadrant semaphore running signals have a back light to show that the lamp is lit and the signal is set at NORMAL.

Lower quadrant semaphore signals with square‑ended arms are home, outer home, starting, or home/starting signals.