Having known that there is an evil force controlling the train, these men, a gunslinger, a vengeful ex-slave, and a runaway, are devising a plan to eliminate that force because it's threatening their lives and lives of all those on board that train.
Made for now and unable to hide budget limitations, the film tries to keep your attention with basic philosophizing on good and evil and occasional nudity and gore, but it's all for nought because there's little substance here.