What does Montag do when the train stops?
I assume you are referring to the main character, Montag, in the short novel
Montag is on his way to see Faber. While on the train, he tries to memorize as much of the Bible as he can, but finds that his mind is like a sieve and he can't seem to retain any of the words. He gets stuck at "..the lilies of the field, they toil not..." Meanwhile, an advertisement is running off the train's sound system and the words "Denham's Dentifrice" is repeated over and over again and this becomes an irritation to Montag.
"The train radio vomited upon Montag, in retaliation, a great ton-load of music made of tin, copper, silver, chromium, and brass."
Just prior to his stop at Knoll View, Montag stands up in a daze and yells out " Shut up, shut up, shut up!" shocking his fellow passengers. He then mouths out the words "Lilies, lilies of the field, I said," before he just manages to slip through the closing doors of the train. He then runs through the tunnels all the way to Faber's house.