I like to see it lap the Miles Questions

Bring on the tough stuff - there’s not just one right answer.

Dickinson offers a lot of hints at this creature's identity, but no definite answer. Sooooo…what is it?
[Spoiler Alert!]
Congratulations! You've figured out that it's a train. If this is a poem about a manmade invention, why bother with all of this animal imagery?
What are the speaker's feelings about the train? She says that she "likes" to see it as it speeds by – is that the only emotion she expresses, or might her feelings be more complicated?
We see a whole lot of the train, but not the countryside it passes through, or its inhabitants. What might this empty landscape signify?