I've been trying to complete this for ages hELP

For your TDA response, think of the similarities you see in the text between a horse and a train. Write a response analyzing how Dickinson uses that metaphor to reveal the theme of the poem. Use evidence from the text to support your response.

I like to see it lap the miles,
And lick the valleys up,
And stop to feed itself at tanks;
And then, prodigious, step

Around a pile of mountains,
And, supercilious, peer
In shanties, by the sides of roads;
And then a quarry pare

To fit its sides, and crawl between,
Complaining all the while
In horrid, hooting stanza;
Then chase itself down hill

And neigh like Boanerges;
Then, punctual as a star,
Stop--docile and omnipotent--
At its own stable door.

TYSM in advance

Your friendly neighborhood struggling student :)