Definition: In this task, you are given a news article. Your task is to classify the article to one out of the four topics 'World', 'Sports', 'Business', 'Sci/Tech' if the article's main topic is relevant to the world, sports, business, and science/technology, correspondingly. If you are not sure about the topic, choose the closest option. Note that URLs in the text have been replaced with [Link].
Input: Train wreckage operation begins A painstaking operation to lift the mangled wreckage of the Berkshire train crash from the tracks has been taking place. The exact events surrounding the crash which killed seven people are still being investigated 

World