Of interest for my secondary-world trams and pneumatic tubeways.

Originally shared by HACKADAY

What keeps the NYC subway from crashing trains using early 1900’s #electronics tech?

The year is 1894. You are designing a train system for a large city. Your boss informs you that the mayor’s office wants assurances that trains can’t have wrecks. The system will start small, but it is going to get big and complex over time with tracks…

http://hackaday.com/2019/01/11/low-tech-high-safety-and-the-nyc-subway-system/