Cuz other countries have it…
I remember NYC. I was always afraid of falling in the tracks lol.
Edit: Reworded the question
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Only if it maximizes profits in the short term.
Other countries have it
Like 3 stations in london have it. A couple in barcelona but not all.
Also in Vienna not all stations have it.
They’re common in Japan and South Korea.
It was in basically every station in Guangzhou, China, where I used to live as a child.
There is no such thing as US Subway.
The US has at least eight subway systems in its major cities.
New York; Chicago; Los Angeles, San Francisco; Boston; Washington, DC; Philadelphia; and Atlanta all have subway systems.
I am aware and none of them are the US Subway system.





