biggest locomotive in the world

However the humans living around the spaceship were different to the humans who are living on earth now. They were so fat that they are can not walk. they travelled around in motorised chairs having a computer screen and cup & straw attached, chatting on phones and if they happened to drop out they simply laid there until a robot emerged and picked them up. The adults were fat, your children were fat! They just laid around all day long meals doing no exercise what so ever and to quote the captain, "Computer, define dancing".