I have that happen occasionally. It appears random and without anything to cause it. I have a small layout that has 3 separate loops. Each is controlled by a separate TIU channel. It never happens to all 3 at once. Normally one increases speed but the others maintain their normal speed setting. Since I have a small layout, the bulk of my curves are O36. Tight curves don't mix well with runaway trains. I have a kill switch that just shuts power off to the whole layout. I shut everything down, power back up, and reboot the engines. It's all fine after that.
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