world's longest vehicle

If someone ask you "which is the longest vehicle in the world?"then you will ultimately answer "the train".Yes you are right,its train,no one is longer than that.But friends,do you know that America's army overland train is 572 feet longer.This train is used to pick up heavy materials like rockets from one place to another.This is considered as the world's longest vehicle of the world.Its weight is about 450 tonnand it has 4 engines and 54 wheels.And at last,it can walk freely on the land.