Building an airplane: A jet airplane is one of the fastest machines on the planet. But have you ever seen one being made? It all goes together like a jigsaw puzzle! Once it's assembled, a test pilot takes the jet out for a flight. Will it pass the test? Soon the jet is ready to get to work flying people all over the world; Ride the mountain rails!: Work train is busy keeping the tracks in good shape. It takes the power of three engines to get up the...