KiwiRail is investigating the incident where two passenger train carriages separated from the front of the train while travelling along the tracks, Stuff reports. The Te Huia train had been running between Papakura and Paerata when the back two carriages decoupled from the front two and the locomotive. The incident occured around 5pm on Monday. Automatic braking kicked in, halting both parts of the train, and none of the 56 passengers aboard the train were hurt.