Welcome back to da UP Tom. Would be interesting if the string of WC covered hoppers, you saw is the same batch that had been at the Manistique Depot, and had been made more numerous and then stored on the passing siding west of Manistique, only to disappear, give or take a month ago. Have photos of the units at the depot, but didn't want to wade through the snow to reshoot the batch on the west passing siding. Were gone before the snow was gone.