This is about a man who feels chained to his everyday, mundane life. The poison air of the subway that never sees the sun nor feels the rain is a metaphor for his life, which is devoid of passion, freedom and love. He tries to recapture the spirit of a long-lost flame, but what he really wants is his freedom back, to be rid of the rattle of his chains. When he sees her, she is willing and welcoming, and does her utmost to please him, but he realises that although he could have her, he's already lost his spirit and soul, his freedom, and therefore won't ever ride that horse/train again. So he has a beer and resigns himself to the company of men just like him, walking the rut in a crowd just like him.