What's the real story of Area 51? Jonathan Strickland joins guest host Ben Bowlin of Stuff They Don't Want You To Know, to explore the science and tech of the secret military site in TechStuff, a podcast by

Categorized: Technology Education

Sep 15, 2010 1:12 PM
How Railroad Crossing Signals Work

Every driver has seen a railroad crossing -- the iconic system of bars, lights and warning bells designed to keep cars away from trains. But how do they actually work? In this episode, the guys explore the technology powering railroad crossing signals.


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