Details can be found at the top of this page:
Comparing the wording to the mileage chart, it seems that the trail is impassible roughly between Hopper (Map 11) and a few miles south of Anthony (Map 10)
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While I may consider simply "smuggling" such items in my checked baggage as I now know some fellow tourist have done (perhaps unwittingly), I'm also thinking about asking Amtrak if I can declare and surrender possession of these materials for the duration of the trip. That's actually the approach I used successfully with my multi-tool pocket knives when riding the ferry from Key West to Cape Coral. The downside with this method is that it causes the Amtrak personnel to "be made aware" that I'm trying to bring this items on board, giving them the opportunity to simply deny my request. I always prefer to avoid being deceptive, but it may be better to play off ignorance of the rules in this situation.
My main fear is that I'll follow Google maps and end up on a two lane road with no shoulder.