Why no track workers? Maybe spawning them in, in random locations, extra points spotting them or deducting of points for not sounding horn quick enough to acknowledging them. Leaves on track, slippery rails Birds flying
This has been mentioned but not for a while DTG put in a system of "dioramas" that can be used to have animated, spot placed activities and trackside workers or equipment is something this would be great for, unfortunately it's another of those missed "fire and forget" items that was done and then never done again. Hopefully in the future...
The old Densha de Go games had this and yes you got extra points for spotting them and sounding the horn.