Why does the narrator believe that the old man groaned ?

Which of the following sentences refers to a conflict between characters in "two kinds"?

Diego rivera was a famous artist from mexico. most of his paintings were murals. murals are paintings that are made directly on a wall. rivera thought that all people should be able to see beautiful art, not just people who could afford to go to museums. this is why he painted most of his murals on the walls of public buildings

This poem describes a train as if it were a horse. what literacy device does the poet use in this poem?