I like to see it lap the Miles (43)

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.