Big_Boy_4005 posted:Murphy's Law of model railroading: trains don't run when guests are present.
Too true.
The last op session I had, I had tested everything that morning and when people showed up and I hit the master switch, nothing. Turns out, one of my throttles was causing the DCC system to re-boot, and was an easy fix. Thank goodness the guy who wired my DCC originally was one of the people running that day!