No, no such thing as a seatbelt. Nor arms. The spellwagon does move smoothly, though... at least most of the time.
The track runs along the river for a while, and it does look pretty. After a little while, the conductor comes by and takes a look at her ticket, and lets her know they'll be getting to Dumrath tomorrow morning; unfortunately other travelers have already paid for all the beds, but they'll be stopping for a few chirps at Silmvale around suppertime where there's a decent restaurant in the station which can pack something in a hamper.
There aren't that many more people in Mira's car, but for a little while - between two local stations - a family gets on with two young boys arguing about some stories from the Days of Wonder. They get off at the next station before they've settled whether it was more awesome to plop a mountain on top of your enemies or turn them all into air-spirits (or beetles; the tales vary.)
Around evening - after the stop at Silmvale - the spellwagon switches to another track, leaves the river, and sets off through a well-farmed plain. There're two more women in the car with her, both with wands in hand, murmuring together something about magic and occasionally practicing spells, occasionally interspersed with grumbling about how it's a shame they'll be getting off in the middle of the night and wouldn't it be nice to go on to the palace someday and see the Queen herself.
Mira sees the full moon rise just after sunset. It looks about the same size as Earth's moon, but clearly not the same - there're fewer craters, but the Man in the Moon has such an obvious face that no one can miss it here.
There're next to no lights, but the moonlight is enough for her to make out waving fields of grain and the occasional town as they rush past or briefly stop.