There are betwwen 50 and 70 coal trains a day through here, either crossing the UPRR bridge in Omaha or across the BNSF bridge at Plattsmouth, about 15 miles south of here, so no shortage of coal trains to watch.
Additionally, you have the chance to see a lot of grain thrains right now as we are just finishing up the harvest season and lots of soybeans and corn are on the move. Much of it is shipped south on the BNSF line from here to Kansas City, but much of the time the power is provided by KCS or Mexican railway engines.
Other traffic you might catch are on the CN which runs from here to Chicago, or quite a few trains out of here on the old Rock Island mainline now operated by Iown Interstate (IAIS). Also the UPRR intermodal yard is co-located with the IAIS and they move a lot of containers in and out of here every day.
Like I said, railfan's paradise