Mainline Scene - Railway Photos by Geoffrey King
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If a long-distance train broke down half-a-century ago, there would often be a loco depot nearby which could furnish a replacement engine at short notice. Depots and resources are now spread so thinly that it could take an unacceptably long time to obtain a replacement, even without the complication of one TOC sometimes being reluctant to help another. So at busy times it became necessary to provide spare engines at strategic points, and a Class 47 diesel is usually stationed at Colchester or Shenfield to cover the Norwich services. Such locos became known as "Thunderbirds."














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