It's pretty clear from prior posts that there must be an on-off switch between the battery and the BlueRail board. I have found some neat places for a small toggle switch on a number of battery powered locos. Also, access to the battery via some form of connector mounted on the loco is quite useful. I use a miniature digital self-powered voltmeter that can be plugged in to the battery connector to check battery voltage. The latest BlueRail system reads battery voltage in the app.
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