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Many of the world's most spectacular railways are surrounded by mysterious stories, tales and sagas. The fact is that what is often seen as beautiful today sometimes has a very dark and chilling past. Many railroads were constructed and used during history's most turbulent periods and have long-buried associations with some of mankind's ugliest deeds. But a great many of these back stories have been lost to the passing years and are now unknown, even to those that work or travel on them every day. These are the Secrets of the Railways...