BANGKOK — A construction crane fell onto a moving passenger train, causing a fiery derailment that killed at least 29 people Wednesday in northeastern Thailand. Another 64 people were injured and rescuers were still searching the wreckage and giving first aid. The derailment occurred on part of an ambitious planned high-speed rail project that will eventually connect China with much of Southeast Asia. The crane, which was being used to build an elevated part of the railway, fell as the train was traveling from Bangkok to Ubon Ratchathani province, according to the public relations office for Nakhon Ratchasima province, where the accident took place. Photos published in Thai media showed plumes of white then dark smoke above the scene, and construction equipment hanging down from between two concrete support pillars. Rescue workers stood on top of overturned railways carriages, some of them with gaping holes torn on their sides, video from public broadcaster ThaiPBS showed. What appeared to be sections of the crane were scattered along the track. Meanwhile, paramedics gave first aid to