30 Aug '15, 12am

Upgrading #train signaling in before the information age #RetroTech!

As a former control systems engineer, I found it fascinating to see how much has changed in the last 40 years…and how much has not. Mimic Panels are still very common today, even though graphical interfaces on computer monitors have taken much of the role. When you have a single static display, everyone can see it at once and analyze at a glance–that’s really important when you’re dealing with abnormal situations. Relay logic is still fairly common in industrial control systems, particularly electrical systems–it works, it’s easy to diagnose, and with more modern manufacturing methods, hermetically sealed relays are dead reliable. Relays can’t be hacked by some guy halfway around the world. And they have a break-before-make design, so you can ensure through *hardware* that two incompatible conditions can’t happen at the same time. I found it interesting that they used mech...

Full article: http://hackaday.com/2013/11/12/retrotechtacular-upgrading...

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