https://wccftech.com/cyberpunk-2077-metro-mod-change-mirror/

A metro system isn't going to be added to Cyberpunk 2077, as the developer has no plans of doing so.

Speaking on his official Twitter profile, CD Projekt Red Global Community Director Marcin Momot confirmed that the developer has no plans to add a metro system to their game, shooting down rumors that have started circulating online in the past few hours.