Chinese beat Japanese in burying the evidence. But then, at least they are not radioactive.
In case you are not aware, the Chinese version of "Shinkansen" (bullet train) collided on July 23, 4 train cars fell off the bridge and killed at least 43, injuring at least 192.
Either they were so quick in determining the cause or they didn't want to know the cause, the Chinese authorities have already buried the derailed train cars. They dug a huge hole (15 meters wide, 5 meters deep) and bury them, according to Yomiuri Shinbun (7/25/2011).
The local residents told Yomiuri that the front car was smashed into pieces and buried. The authorities have also been busy deleting any message on the Internet critical of the government's handling of the accident.