Peninsula’s got a very  28 Weeks Later (if comparing Train to Busan as 28 Days Later in that whatever’s happen has been normalized, minus the re-occupation as these zombies aren’t rage infected humans that eventually die)/ Doomsday (The 2008 Rhona Mitra movie not the DW ep which starts off as Get The Thing from the Infected Zone and quickly goes off the rails) and I am Legend  (The overgrowth and some zombie rules) feel.