The idea of a railway from the Zambian Copperbelt to the Indian Ocean via Tanzania had long been considered. But although the first serious report was published in 1952 by a consultant from the British Colonial Office, it was not until 1964, the year of independence, that further studies were commissioned, all of which eventually found such a railway uneconomic. The World Bank mission erred in tying the cost estimates to the trans-shipment of goods (due to gauge differences), and ignoring the option (actually taken) of constructing a direct line to Dar es Salaam. The U.N. team argued that the reasons for the project were too speculative, that the existing railways had spare capacity, and that the likely development benefits were invalid, unless an iron and steel complex emerged. In 1965 the authors of the Brookings Institution study felt that the project was an unnecessary duplication of existing facilities, and that transport matters in the region should be depoliticised, an idealistic proposal since there are external benefits and costs involved in the operation of railways.
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