Got stopped by a CN freight westbound thru Schoolcraft (south of Kalamazoo MI) Saturday afternoon. Near the end were 17 MWCX gondolas. These were the black ones with the white lids like I've seen pictured at the Humboldt nickel plant. I've never been sure what routing these cars took to Sudbury so...where these empty cars returning to the U.P. or similar cars going somewhere else?