I've been privy to discussions with a connection at one of the class 1 railroads who assured us that particular railroad is planning some kind of commemorative unit, but that it was undecided what the livery would be, what type of locomotive it will be applied to, and that he expected that details would not be finalized until just a few months before 7/4/2026.
I think the overall political climate, and that the theoretically non-partisan America 250 commission has been co-opted by former White House and campaign employees, and picked up several sponsors that are friendly to the current administration, has dampened the excitement for some.