Hoping I don't get on the wrong side of ColinB, here. I use Zimo sound decoders and lais stay alives. I set CV153 to 20 which is 2 seconds and CV 111 to 1. CV 111 set to i negates the braking effect from CV 4, so the loco stops dead after the 2 seconds. This stops it from running into anything. The advantage of stay alives is, as others have said, is that a dead spot, such as dirt or a gap in the contacts of a turntable don't cause the sound to restart.