As of mid-year, my single variable economic indicator is still going strong. According to the American Association of Railroads, “North American rail volume for the week ending July 14, 2018, on 12 reporting U.S., Canadian and Mexican railroads totaled 374,909 carloads, up 4.6 percent compared with the same week last year, and 374,090 intermodal units, up 4.7 percent compared with last year. Total combined weekly rail traffic in North America was 748,999 carloads and intermodal units, up 4.7 percent. North American rail volume for the first 28 weeks of 2018 was 20,148,123 carloads and intermodal units, up 3.5 percent compared with 2017.” America is on the move. Will tariffs crash the party?