I live in a rural area, but there are two, maybe 3 areas where filming a train around here would be feasible:
1. At the nearby station in a small town, but with houses nearby I'd rather not have in my shots.
2. At a remote trestle near a local landfill, but surrounded tightly by trees.
3. At a crossing near the industrial park, but with an open field on 2 sides.
This third area would be my choice simply because there is more room to park off the road, even though it is on someone's field access road, which might be a problem for them since it's Farming Season. As well, I can point the camera towards and across the tracks, so I'm not filming someone's private property, other than the farmer's wide-open field. For Southbound trains, I'd be on the opposite side of the road at the crossing, which means idiots in motorized vehicles trying to weave through the gates.
For Northbound trains, I'd have to face the industrial park and those unsightly facilities (including the one I work at), and would have my back to vehicular traffic.
While the Q500 4K is certainly not large enough to obstruct the view of the engineer or that of vehicular morons, the eye is drawn to both motion and the unfamiliar. Hence, a drone, if noticeable, is a distraction. With the heightened paranoia surrounding personal privacy as well as the Drone Operator Downs Airbus Killing 500 Pregnant Women And Sick Children "news reports", either one could file a complaint while I'm filming, and then I have to play 20 questions with Barney Fyfe. And maybe hide a body.