Hello how may I help you? I have a question about world records. What record do you have questions about? I want to know what the longest thing in the world would be? That is too vague. Can you be more specific? How about the longest train? Is this for freight or passenger trains? How about passenger train? The longest passenger train on record was 1000 meters long. That's a pretty long train. Was the freight train any longer? Yes, The freight train was over 10x that length.