We were in Konstanz for a week in summer 2017. My memories of the railway are a level crossing at the end of the station which gave access to the harbour. I did see that signal box so I guess it's gone. The road, railway and pedestrians all have their own parallel bridges over the Rhine.
Passenger trains on the DB side were double deckers with 'Electric Containers' for traction.
My one photo of trains on the SBB side show another suburban double decker - ie not IC2000 and a railcar, probably a Flirt.
I don't remember any freight but to be honest unless it's an intermodal, I tend not to notice
David