The New York Times had a very visually compelling article a few months ago about how a good part of the city's subway system is still manually-operated. https:

The New York Times had a very visually compelling article a few months ago about how a good part of the city's subway system is still manually-operated. https://www.nytimes.com/interactive/2025/04/20/nyregion/nyc-subway-signals.html https://www.nytimes.com/interactive/2025/04/20/nyregion/nyc-... For me, this was the best picture: https://static01.nytimes.com/newsgraphics/2025-03-10-subway-signals/_images/oldsignals_scroll-@@-2400@x2.webp https://static01.nytimes.com/newsgraphics/2025-03-10-subway-... Someone has to stand at that machine 24 hours a day and push and pull levers to keep the trains from whacking one another.