CN Flint & South Bend
While not a very busy line, the CN Flint and South Bend offer some very scenic shots with bursts of activity. From the old depots of Michigan, to vast open fields of Indiana, there are lots of opportunities for catches to be made.
Stretching from Chicago, Illinois, to Port Huron, MI, this video covers most of the sub on the Michigan side; having the more scenic shots in rural areas.
Feel free to watch this video in multiple sessions. I don't expect everyone to be able to watch the entire 5 and a half-hour video in one sitting.