https://www.youtube.com/watch?v=g7CxiqNnm80
While LA has a subway, it's not that extensive. Of course several other cities have more lines.
What the future has in store for Sydney's Metro! https://www.youtube.com/watch?v=rZlV329Ba8g
Inside the $60 Billion Metro Transforming Sydney https://www.youtube.com/watch?v=Pe3y7Rlhk9c&t=2s
