You could design them with frosted windows or blinds that obstruct passengers from looking at downwards angles, so they could still see the horizon and the sky.
I think I've read about a train being build through a city somewhere, where it'd pass close by residential buildings, but only briefly. This was solved by installing "Smart glass" so they windows are obscured temporarily when going past the buildings.
I think I've read about a train being build through a city somewhere, where it'd pass close by residential buildings, but only briefly. This was solved by installing "Smart glass" so they windows are obscured temporarily when going past the buildings.