Our model railroad club has two handheld DCS controllers. Unit one would not startup an engine the other day; upon further investigation, we found that it would load engines into the system (we deleted and reloaded the engine that would not start using unit one). Also, once an engine was started using unit two, unit one could perform all other functions (run, whistle, bell, couplers and shutdown). Batteries are good; my simple mind says maybe the "3" button on the controller (which initiates startup) is bad. Does that make sense; can you think of a way to troubleshoot this?
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