Here is the article WSJ just dropped regarding the strike. This link should be fully accessible to non-members but let me know if it's not.
TL;DR from the WSJ newsletter:
“Union members had been working without a contract since 2019. The talks were an opportunity to protest new attendance policies at some of the companies. President Biden and White House officials interceded to broker a deal that includes about 24% in wage increases through 2024. The agreement must now be ratified. With a strike likely averted, Amtrak is restoring its suspended long-distance train services.”