The Association of American Railroads (AAR) reported U.S. rail traffic for the week ending May 7, 2016: Total U.S. weekly rail traffic was 492,923 carloads and intermodal units, down 10.6% compared with the same week last year. Total carloads for the week ending May. 7 were 233,047 carloads, down 14.8% compared with the same week in 2015, while U.S. weekly intermodal volume was 259,876 containers and trailers, down 6.4% compared to 2015. Three of the 10 carload commodity groups posted an increase compared with the same week in 2015. They were miscellaneous carloads, up 6.7% to 9,839 carloads; chemicals, up...