From an Amtrak/MDOT press release:
Temporary train cancellations, schedule changes, and service substitutions needed to allow completion of track work
Following work set to begin April 16, Amtrak services for Wolverine and Blue Water passengers can expect normal travel times on Norfolk Southern Railway (NS) track in Michigan by early May.
While NS crews work to eliminate the temporary “slow orders” the railroad imposed on March 15, certain trains will be cancelled, have different schedules, or have segments covered by dedicated motor coaches, to allow completion of track work on April 16, 17, 18 and 19 (see attached.) Amtrak service in mid-Michigan will continue to be delayed from 45 to 90 minutes on Pontiac-Detroit-Chicago Wolverine trains, with lesser delays to the Blue Water trains to and from Chicago and Port Huron.
Train 350, the morning eastbound Wolverine from Chicago to Pontiac, will terminate at Kalamazoo. Passengers continuing east of Kalamazoo will be accommodated on a dedicated bus serving Battle Creek and Jackson, where passengers will reboard a train for the remainder of the trip to Dearborn and intermediate stations.
Train 351, the morning westbound Wolverine from Pontiac, will terminate at Jackson. Passengers continuing west of Jackson will be provided with dedicated bus service to Battle Creek and Kalamazoo, where they will reboard a train for service to Chicago and intermediate stations. The Kalamazoo departure of the continuation of train 351 will be 90 minutes later, at 11:20 a.m., arriving in Chicago at 12:54 p.m. CT.
The late morning Wolverine 353 from Pontiac to Chicago is cancelled. The early afternoon Wolverine 352 from Chicago to Pontiac is also cancelled.
Wolverine trains 354 (Pontiac to Chicago) and Train 355 (Dearborn to Chicago) will continue to operate with delays until the track repairs are completed. Blue Water (Train 365) operating eastbound between Port Huron and Chicago, will depart Port Huron two hours earlier at 4 a.m.
All intermediate stations between Port Huron and Chicago also will be served two hours earlier than the published schedule. Amtrak has posted temporary schedules for service on the Wolverine and the Blue Water (364 and 365.) The Blue Water uses NS-owned track between Battle Creek and Kalamazoo. Further significant temporary changes to accommodate track work after April 19 will be announced as details become available in Passenger Service Notices at stations, shown as part of the booking process on Amtrak.com, and posted at Amtrak.com/Alerts.