A year after the Wright brothers' historic first flight, another inventor, an American physicist called Robert Goddard, proposed an entirely new form of transportation: the vactrain.

莱特兄弟历史性首次飞行一年后，另一位发明家、美国物理学家罗伯特·戈达德 (Robert Goddard) 提出了一种全新的交通工具：真空火车。