PITTSBURGH — President Donald Trump and Democrat Joe Biden kept up their debate-stage sniping from the road and the rails on Wednesday, fighting for working-class voters in the Midwest while both parties — and the debate commission, too — sought to deal with the most chaotic presidential faceoff in memory.

Biden and wife, Jill, traveled through Ohio and Pennsylvania aboard a nine-car train bearing a campaign logo, a throwback to Biden’s days as a senator when he commuted most days via Amtrak from his family’s home in Delaware to Capitol Hill.

He drew several hundred masked supporters to one afternoon stop in Greensburg, his largest crowd he has had since suspending traditional events back in March, according to his campaign.

Trump, meanwhile, was attending an afternoon fundraiser in Shorewood, Minn., a suburb to the west of Minneapolis, before appearing at an evening campaign rally in Duluth on the shores of Lake Superior.