Answer:
And neigh like Boanerges;
Explanation:
To neigh is the sound made by a horse. The poetess , on the line above, has personified the train as if it were a horse. When the train is about to arrive at a station, it blows a whistle , which sounds as it were a horse neighing. Besides, Emily Dickinson has pictured the horse's sound as if it were coming from the son of the Thorn God. All these literary devices make the train sound like a strong and brave divinity.