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TechStuff

How do we make fire? What's the state of 3D printers and what's it like working with one? Learn the answer to these questions and more as Jonathan and Lauren explore the science behind all things tech in TechStuff, a podcast by HowStuffWorks.com.

www.howstuffworks.com/

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.

podcasts.howstuffworks.com/hsw/podcas...

 
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