"The Final Lesson" + Undisputed Claim train bug

[shrug]

I've seen the reports for the Undisputed Claim's train bug. If you fast travel from within the train, the doors to the train will remain "sealed." The solution is simple enough, use the map to fast travel. Unfortunately, I am experiencing this particular bug (possibly from fast traveling out of the train far earlier in the game) after arriving on the Undisputed Claim at the beginning of "The Final Lesson" quest, where I am charged with 

Spoiler

making my way to and subsequently killing Auntie Cleo.

After entering the Undisputed Claim for the first time during this quest, the station seemed totally normal, except for some flavorful loudspeaker commentary from Auntie Cleo. When I gave up on waiting for the train doors to open, I left and came back. After returning, there was more battle evidence and blockaded doorways, but the train doors were still "sealed." I've departed and returned multiple times to see if it would trigger anything, but it hasn't helped. Has anyone else experienced & solved this issue?