Passengers that use Chicago's Metra commuter trains will know by the end of the month whether security during the NATO summit will affect service.
Metra spokesman Michael Gillis said Wednesday the U.S. Secret Service will announce finalized security plans at the end of April. Included in those plans will be whether rail lines that run under McCormick Place will be shut down during the summit, which will be held at the convention center May 20 and 21.
The security measures could have an effect on the South Shore and Metra Electric lines, as well as Amtrak and the Canadian National Railway.
The final day of the summit falls on a Monday, when there would be about 18,000 commuters alone on 172 Metra Electric trains using tracks under McCormick Place.