U.S. railroad traffic increased by just 1.0% on a year earlier in October, in part reflecting lower commodity exports due to the China-U.S. trade war. An agreement between President Trump and President Xi to reduce tariffs may be needed to reverse that trend. By contrast, the completion of U.S.-Mexico-Canada Agreement (USMCA) trade negotiations removes some of the doubt regarding cross-border rail traffic, which climbed 12.6% in the third quarter of 2018 vs. a year earlier. That was led by Mexican imports of commodities that would otherwise have gone to China including soybeans – whic...