The City of Ann Arbor issued the following announcement on June 2.
Work on the Allen Creek Railroad Berm project reached an exciting milestone on May 12. During a 37-hour period, a cooperative effort by Amtrak and contractors removed the railroad tracks, excavated the site, placed 20 pre-cast concrete culvert sections, back filled the excavation and replaced the track. This around-the-clock work was completed in time for the Chicago train's evening arrival. https://www.youtube.com/watch?v=6XHFXikGr-Y&t=2s
Original source can be found here.
Source: The City of Ann Arbor
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