As I've frequently said, the absolute best place for the TVS is inside the locomotive directly across the track power feed. Obviously, this is also the hardest place to install them, and you have to modify every locomotive. Of course, while you're in there, you can add the 22uh choke in the track power feed for any TMCC/Legacy locomotives to minimize any effect the their electronics on the DCS signals. If you choose to do that, the best way is to put the choke in the center track feed and then the TVS diode across the feed after the diode. That way the DCS signal isn't significantly affected by the bulk capacitance of the TVS diode in the locomotive.
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