How is the essence of the poem captured in the lines ‘two tickets to Happiness’?

The narrator and his lover are homeless refugees who have no place to settle permanently. They agonize their loss of home and identity as human beings. The given line presents a hint of hope for the refugees who can board a train to freedom from merciless killing and deprived state of living. But in reality even the coaches on the trains are full, the tickets are too expensive to afford or they are turned away. Hilter had declared that they had no right to live so they cannot hope to escape from a life where the cruel Nazi soldiers are hunting them constantly for slaughter or endless wandering.