https://akashicmultiverse.blogspot.com/2019/08/urban-transit-systems.html ,
https://multiversevectors.blogspot.com/2019/08/urban-transit-systems.html ,
https://en.wikipedia.org/wiki/Proposed_expansion_of_the_New_York_City_Subway#21st-century_expansion
https://en.wikipedia.org/wiki/Copenhagen_Metro#Trains
https://jf-databits.blogspot.com/search?q=urban
