Seems despite the train having broken seals or whatever, the people still insist on riding it. Even if they gotta wear their own masks to do so. No matter what, life's gotta go on...even if the apocalypse happened. I think the fact that the people in this piece are each wearing a different mask is an excellent part! The background being almost all green and the windows yellow emphasize the whole aspect of the "world's gone to shit." Very excellent job!