As you can see, maintenance on this track has been deferred for a long time (decades apparently). The video above is actually sped up and condenses the 6 minutes it actually took the train to cross this wobbly section of the tracks into what you see above.
The footage above was filmed by Scott Taipale who adds:
PREX 1603 leading PREX 3054 blasts down the former Wabash Railroad’s 5th District! Lol actually I condensed 6 minutes of the train crawling down the track! This is only the third time I’ve gotten a pair on one of their trains so I was pleased to see them. The line was most recently the Maumee and Western Railroad (MAW) before being purchased by Pioneer RailCorp. Maintenance was deferred for decades on this stretch of track. Pioneer has done a great job rehabbing the worst parts but some pockets like this still exist.
You can find more interesting train videos by Scott on YouTube.