How did the name trainguy9000 made up?

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Trainguy9000 started with roblox.his old account legostationmaster (which he lost) became friends with trainguy4000,lego just came up with the username that will make him inpreesed. But for the past 2 months he wants to stay on that account when he plays roblox.then... in 2011 he reached over 100 friends ,but in 2013 he had over 500 friends! he only has 697 friends (trainguy9000) he was happy to get all of these 697 friends.

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in 2012 trainguy9000 started makeing videos his brother (ontray) made less videos. ontray started 2 days later before trainguy9000 but he has more friends like idk how many he has.But let me tell you about him:

Name: trainguy9000
Years active:2012-present

born:Apr,7 2004 (aged:9)