The Dow Jones Transportation Average /zigman2/quotes/210598063/realtime DJT -0.48% slumped 0.5% in afternoon trading, to buck the strength in the broader stock-market indexes, led by weakness in trucking and rail operators. Of the Dow tranports' 20 components, 14 traded lower, while the Dow Jones Industrial Average /zigman2/quotes/210598065/realtime DJIA +0.46% rallied 117 points, or 0.4%, with 23 of 30 components gaining ground. The S&P 500 /zigman2/quotes/210599714/realtime SPX +0.51% rose 0.3% and the Nasdaq Composite /zigman2/quotes/210598365/realtime COMP +0.47% tacked on 0.2%. With the Dow transports, the biggest drags on the index's price were the shares of Landstar System Inc. /zigman2/quotes/207418022/composite LSTR +0.08% , which fell $1.70, or 1.5%; Union Pacific Corp. /zigman2/quotes/209717171/composite UNP +0.05% , which gave up $1.63, or 1.0%; and J.B. Hunt Transport Services Inc. /zigman2/quotes/205536609/composite JBHT +0.20% , which shed $1.35, or 1.2%. The best performer was Matson Inc.'s stock /zigman2/quotes/205690765/composite MATX -1.48% , which rose 66 cents, or 1.8%. The Dow transports' divergence comes after it shot up 2.6% on Thursday, while the Dow industrials rose 373 points, or 1.4%.