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CTA rails get high-tech checks

Apr 5, 2010 1:56:00 AM - chicagotribune.com
Lasers supplement trained eyes to find defects along tracks

Since the 1800s railroads have relied on a measuring stick and a trusty set of eyeballs to make sure tracks are properly aligned, which is essential to preventing derailments. It might be surprising, but the Chicago Transit Authority still uses that low-tech approach on a daily basis.

USA, Illinois: (Latest Stories)