Final answer:
The provided excerpts do not directly reference a stanza where a train is compared to a horse. Instead, they offer examples involving horses and metaphors but lack a specific poem illustrating this comparison.
Step-by-step explanation:
The stanza that makes it clear that the train is being compared to a horse can be identified in the context of poetry or literature where such a metaphor is used. However, the excerpts provided do not directly reference a train being compared to a horse. Instead, they provide various examples of horses and metaphors, but without a specific stanza from a poem that compares a train to a horse, it’s not possible to determine which stanza would make this clear. The closest metaphor is in the text where a political poster utilizes the metaphor of a train to represent a strong, wise leader in control of a huge and powerful machine, but it does not compare the train to a horse.