If you look at a map of the Chicago & Eastern Illinois, it forked south of Woodland, IL into branches to Danville-Evansville and to St. Louis. The St. Louis branch then had another branch leave it southwest of Findlay, IL, to head south into Illinois' coal country. It is this southern branch that crosses the Kaskaskia River valley.
An "artsy" view from underneath the trestle and a rare blue sky.
Kaskaskia River bank.
This has to be a unique view of a train on the trestle because a real railfan would choose a view on top at one of the ends or a distance view such as in that field into which I could not get. And many would have trespassed to get on the sunny side of the trestle. The video is good enough to show the trestle is well maintained. It appears the train can maintain track speed across it, and you do not hear a lot of clicking and clacking as it crosses.
A more traditional railfan video That is a lot of plastic pellets going somewhere. The four-bottom pneumatic covered hoppers are typically plastic pellets. And the reporting mark of FPAX, Formosa Plastics Corporation, confirms that it is probably hauling plastic pellets to companies that mold the plastic into products. It looked like a unit train of plastic, but there were some tank cars near the end.