I'm with BobbyD, there is a track issue that needs to be addressed. You do not need a closed loop of track for it to be powered correctly. You do need a closed loop to complete an electrical circuit, but the locomotive itself acts as the loop closer for the path of electricity. If the locomotive stops on your test track, then the joint it just passed is bad and not passing electricity through. A voltage meter would help you see that. As for a buzzing from the track, that is also a sign of a bad connection and should be addressed as it could heat and start a fire. Remember you have to pull FT apart without bending or rotating at the joint. If you don't then it widens the rail and causes a drop in electrical contact. A buzzing from the locomotive itself is a different matter.
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