The title of the song refers to the mathematical equation "2 + 2" which, in the context of the song, represents the man's struggle to make sense of his life and find a solution to his problems. The song also features the recurring motif of a train, which can be interpreted as a symbol of the man's journey towards recovery and the hope that he will eventually reach his destination.
The song's message is one of hope and resilience, and it encourages the listener to never give up on themselves, even when faced with seemingly insurmountable obstacles. The song's lyrics offer a sense of solidarity and understanding for those struggling with addiction and other challenges, and it serves as a reminder that there is always a chance for redemption and a better future.