For context, the only recent rail disasters with death tolls in that range involved gas explosions or a tsunami. The alleged accident seems to have taken place at ground level too. The source is naturally an American book that claims to show "the real North Korea" and mostly cites random defectors in South Korea.
"rumored to be about 700" 
For posting all the anonymous reactionary bullshit that you can't post anywhere else.
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In bad country, a train derails due to negligent and evil owners and permanently kills all wildlife in a 100 mile radius, gives tens of thousands of people cancer, makes the local area unlivable for the next 200 years, contaminates the entire state’s water supply forever, and the government says nobody died