Horse Racing   A handy reference for horse racing and parimutuel betting enthusiasts.

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what is...
RAILS RUN
A horse can be stuck on the fence behind the leader, with other runners behind and next to it, and unable to get a clear run to the finish line. However, sometimes the leader will move out wider on the track when under pressure in the run home, enabling the horse to scoot through along the rail to the finish line.

    Courtesy of the Horse Racing Glossary
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