- With no obitals lit, the main signal is a slow speed signal
-
Oritals upgrade the signal
10 12 2 Signal 8 6 4
- 10 o'clock - Normal to Medium
- 12 o'clock - Normal to Normal
- 2 o'clock - Normal to Slow
- 8 o'clock - Medium to Medium
- 6 o'clock - Medium to Normal
- 4 o'clock - Medium to Slow
- None - Slow to Slow
http://position-light.blogspot.com/2016/06/better-know-signaling-system-b-color.html