The Great Train Revival For years the world's railways steadily declined. Now trains are facing their biggest revolution since the discovery of steam and the age of the Iron Horse. The prospect - a railway revival in the 70s that may change our habits, even affect the / place we live in. In Japan, there's a 130 mph train, going as fast as an airliner when it lands. It covers the equivalent distance between London and Edinburgh in just over three hours. British Rail plan to introduce a 150 mph train soon. Speed pays. In Japan, Passengers have trebled in five years. When the super-train comes to Britain, cities like London, Manchester and Bristol will come within commuting distance of each other. High speed too won'pose only technical problems. In France, train waiters are already attending special ' equilibrium ' classes and psychologists say that the new trains will have to carry airline-type hostesses to reassure passengers. Beyond the Iron Horse, scientists are working on even faster trains - trains without wheels and even trains that will blast off like rockets. Written and produced by MICHAEL WEIGALL