Why do you suppose Whitman focuses on the train during winter rather than another season?

Whitman focuses on the train during winter to evoke a sense of solitude and reflection, emphasizing the stark contrasts between the bustling movement of the train and the stillness of the winter landscape. Winter symbolizes a time of introspection, and the train serves as a metaphor for life's journey, navigating through challenges and desolation. This setting enhances the emotional weight of the themes of connection and isolation present in his work. Additionally, the imagery of winter can evoke feelings of both harshness and beauty, mirroring the complexities of human experience.