Without spending a lot more time tinkering and tracing, I couldn't figure out if I could find a place to use a supercap. However, the large conventional cap on the raw rectified power gives me a bit more than two seconds of sound. This seems sufficient for most brief power interruptions running over switches. I prefer this to the solution I was considering, adding a tether between the locomotive and tender to bring track power over and share the rollers. This keeps the simple drawbar connection intact and solves the sound drop-out issue.
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