Subway service changes: J and M trains disrupted over five weekends so MTA can replace aging switches

Service changes are coming to the J and M trains over five weekends between the middle of next month and late November, MTA officials warned riders during the agency's monthly board meeting on Monday.The transit authority is adjusting schedules for the three lines, which run on elevated tracks through Brooklyn and Queens, in order to replace nearly three-decade-old switches that are past their useful life, officials said. The mechanisms are used to move trains between local and express tracks du