Two South Shore Line stations in Chicago will close Saturday and Sunday to accommodate construction.

Buses will be used to transport riders between Millennium Station and Metra’s 18th Street Station, a ride of about 10 minutes, the railroad announced Monday.

The Museum Campus and Van Buren stations will be closed both days; buses won’t stop there.

The 18th Street Station has a large flight of stairs, so passengers with mobility issues should use the McCormick Place stop instead.

Bikes will be prohibited on buses, but westbound South Shore Line riders can take the buses as far as McCormick Place.

The construction project is part of the $650 million expansion of South Shore Line service on the Metra system, expanding capacity north of 18th Street to accommodate additional South Shore Li

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