Railway systems have long been critical. Mass transit systems move hundreds of thousands of people throughout urban areas each work day. Freight systems move an estimated 40 tons of freight for every person in the U.S. every year. Imagine the chaos if they were disrupted. Railway operators now use open-source, commercial off-the-shelf (COTS) control systems. That multiplies the challenge of securing systems from those who wish to disrupt lives or the flow of products and services.”]
Source: https://www.csoonline.com/article/3281096/growing-cyber-kinetic-threats-to-railway-systems.html