The ruling cited concerns about the appearance of bias, pointing to comments that the judge who presided over the trial of three former police officers reportedly made afterward.
A community rally in honor of Tyre Nichols after three former Memphis officers were acquitted in the fatal beating that lead to his death in Memphis in May.
The Mississippi Civil Rights Museum put the gun on display Thursday, soon after the federal government released thousands of pages of records on the Till case.
Driving may be faster, but the inaugural train trips between Mobile, Ala., and New Orleans this week drew travelers eager for a different kind of adventure.