When energy is needed, the cars are released, and as they run back down the track their motion drives a generator.

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Local police did little to track down the missing girl, saying she'd probably run away from home.

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Finally home, I run to the computer to see what he could possibly do to track me down.

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We took over the west coast, which was 30 year old track, 30 year old trains, that was almost completely run, run down and not, not performing.

BBC: News Online

Progress is extended by reaching checkpoints before the clock winds down ala retro arcade racers, and no single run is alike thanks to a dynamically shifting track.

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Although the goal came through the heart of the much-talked-about Chelsea defence, it was the midfield's failure to track Bowyer's run that allowed him to get on the end of Jerome's astute nod down.

BBC: Birmingham 1-0 Chelsea