You’d generally forgive a zombie movie for being shallow and uninventive, as long as the story generates the proper tone and mood. Writer-director Yeon Sang-ho’s Train to Busan deserves commendation for not only nailing the bleakness of and terror of a zombie apocalypse, but for infusing such a story with genuine heart, emotion, and intriguing subtext. It is rare that a zombie flick can elicit tears as readily as screams, but Train to Busan is the rare example of the complete package.