Tube maintenance consortium Tube Lines has boosted pre-tax profit by 24 to £73.1m in the year ended 31 December 2007. Figures for 2006 cover the last nine months of the year, when pre-tax profit was £45.2m. Comparable turnover at the company, in which Amey and Bechtel are the two shareholders, rose from £852m to £855m. Its profit margin increased from 6.9 to 8.5.
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