In Detroit copper theft was an epidemic a few years back. Once the easy stuff in abandoned houses was gone thieves went further afield. .
A few brave thieves went after power substations. For some thieves a lack of knowledge was fatal.
https://www.freep.com/story/news/local/michigan/detroit/2017...
An example shown when I worked around a 7000A rail was also two men. One formed a circuit and the other tried to pry him off.