For decades, CES trundled along as a venue for makers of radios and gaming machines, but it picked up real steam only when it inherited the substantial traffic generated by the death of Comdex in 2003.

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Whereas the Blue Train is pulled by no-nonsense diesel and electric engines, Rovos offers passengers a retro whiff of steam, though only for the first hour into or out of Pretoria.

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With the usual steam injection methods, only a quarter or so of the oil trapped underground can be recovered.

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