This has been going on for a month and a half but I hadn’t noticed — receive a 20% bonus when converting Midwest Miles into Amtrak points through September 30th.
A bit late to start accumulating Midwest Miles for this purpose, but this provides an opportunity to underscore the value of those miles. You can earn Midwest Miles when traveling on American Airlines or Frontier. And by converting Midwest Miles to Amtrak you can then move them (up to 25,000 per year with no devaluation) into either United or Continental.