Where in Detroit to watch trains?

Hey there. I am a train fan. A rail watcher. Newish to the city. I also like to go watch the freighters but they're not active right now. Where can I go to watch trains on the east side and east side suburbs? Any idea of timetables? Is there a train traffic app like there is for freighters? The one for ships is called MarineTraffic. I'm not interested in Amtrak. Any other Rail fans out there? Thank you!