Metra’s Union Pacific north line commuter train schedules will change beginning Aug. 22. 

The changes are being made because the line will be reduced to a single track to accommodate a $185 million bridge and retaining wall construction project, Metra said in a prepared statement. Twenty-two bridges on the north side of Chicago will be replaced with the construction split into two phases. 

The first phase of the project calls for 11 bridges to be replaced between Grace and Balmoral. During the second phase, 11 more bridges between Fullerton and Cornelia will be replaced. The project is expected to be completed at the end of 2018. The current bridges are more than 100 years old. The new bridges will offer increased passenger safety and will last for another 100 years, says Metra. 

There will be no disruption of service at any of the Union Pacific North Line stations during construction, says Metra, but there will be adjustments to the train schedule, and riders are urged to view the new schedule at www.metrarail.com

A new Ravenswood Station will also be constructed during the first phase of the construction project. The new station will offer riders longer, covered platforms, warming shelters, a ticket office, vendor space, ramps and stairs. Work on the Ravenswood Station is expected to be completed by the end of 2014. 

Construction updates for the entire project will be posted on Metrarail.com. Passengers who would like to be notified when there are updates should go to www.metrarail.com, sign up for a “My Metra” account or log in to their existing account, select the UP North Line and check the box that says, “email notifications of service alerts on my train routes.” Passengers can also receive updates following on Twitter @MetraUPN.