18
18 and 19: The backside of my train order control panel
showing the rotary switch, two push buttons and LEDs.
White is ground. Blue is not used. Red, yellow, and
green connect to the switches and LEDs (21a).
19
An ugly "work around" yellow LED
in series with a red LED (21a).
Up the Creek Column - 11
That next day I attempted to re-verify the problem. Guess
what? The semaphore system was back to working properly,
again. I hate intermittent problems! I set both semaphore
blades to yellow and waited. Several hours later the sema-
phores switched to red by themselves. I set them to yellow
again and this time they stayed yellow until midnight.
The next day, I set the semaphores to yellow around 10 a.m. By
noon one of them had changed to red. I set it back to yellow
and waited. As of 6 p.m. both semaphores were still yellow.
20: The Oakhill operator's desk with the train order con-
trol panel installed.
20
MRH-Oct 2013
