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The Circuit System

Metrorail is divided into blocks, which are varying lengths of track. Within each block is a track circuit, which sends information and speed com- mands to trains. Computers are set to maintain a two-block distance between trains.

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Metro Control System Fails Test
Article | A train control system that should have prevented Monday's deadly Metro crash failed in a test conducted by federal investigators, officials said yesterday, suggesting that a crucial breakdown of technology sent one train slamming into another.

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