U.K. train fares will rise by as much as 15 percent as pf Jan. 2 to help pay for upgrades of the rail system, sparking outrage from some commuter groups and unions. Average regulated fares, which include season and saver tickets, will increase 4.8 percent, the Association of Train Operating Cos. said in a statement. That's 0.6 percent above inflation as measured by the Retail Price Index.