Poem:
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.

Question:
Docile means gentle and obedient, and omnipotent means all-powerful. How does the poet portray the train in this poem as both docile and omnipotent?

(This is a short answer)