Ever since Paul Theroux embarked in London on the first train of his Great Railway Bazaar, railways have been a rich source for the best travel writing. This is truer than ever in the twenty-first century. As the environmental implications of relentless air travel cast an ominous shadow over the prospect of foreign adventure, the opportunity to jump on a train at St Pancras and be whisked straight to the continent offers a wonderful alternative. Train travel has assumed a new pragmatic importance as well as romance - which is no doubt why so many more tour companies are offering a great train ride as part of their holiday itineraries. Now, Michael Kerr, the Telegraph's deputy Travel Editor, has burrowed deep in the newspaper's archives and collected together the very best of its writings about the railway: here are journeys non-stop from London to Vladivostok; across the Canadian Rockies; the first train to traverse Australia from Darwin to Alice Springs; and on the teeming, crawl