CHICAGO (CBS) — A warning for Northwest Indiana commuters: Avoid traveling on the South Shore train line during the NATO Summit.

Riders can expect major delays, several cancellations and restrictions on what they can carry on board.

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The Northern Indiana Commuter Transportation District (NICTD) is canceling eight westbound trains that arrive into Chicago, between 11 a.m. and 7 p.m. on Monday, the final day of the summit at McCormick Place.

“NICTD advises passengers to postpone travel on NATO summit days if possible,” the rail agency said in a statement.

READ: Full List Of Canceled Trains, Security Restrictions

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In addition, four trains leaving Chicago on Monday are canceled, including the 5:32 p.m. rush hour train. The McCormick Place and Museum Campus stations will be closed May 19-21 as well.

Commuters can expect significant delays for security sweeps on Sunday and Monday. Each train will be screened by security officials with canine units at the station in Hegewisch. The South Shore trains, along with Metra Electric trains, run underneath McCormick Place.

Metra announced its security restrictions last week.

“Due to the heightened security presence, any significant threat or onboard disruption will result in the train being rejected from the McCormick Place red zone and reversed to its origination with intermediate stops,” NICTD said.

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On May 20-21, riders will also be limited to a carry on bag no bigger than 15 inches by 15 inches and four inches thick. Riders are prohibited from carrying luggage, boxes or bicycles. No drinks of any kinds are allowed. There will be no alcohol allowed from May 18-21.