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if you have a train in moiton in reference to stionary embankment.and the train is 20 ft long.if you have 5 points along the embankment abcde.between ac=ce,ac and ce is 20 ft.so when you speed the train up to a certain point as the front of the train reaches c the train fits between ac.then as the back end of the train reaches c.the train fits between ce.but if its fast enough.to the stationary observer,the both the trains front and back are at c at the same time,giving the train no length.but on the train if the observer was in the middle.when the front of the train is at c he's at b.when the back of the train is at e,he's at d.so to the observer on the train he 20 ft of length when to the stationary observer the train has no length.