Cyberpunk 2077 revealed the train system was cut by the developer

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If you often glance at the clear sky Cyberpunk 2077players may have noticed that the tracks intertwine with the overhead highway system of Night City. These tracks are connected to train stations that are almost completed, which proves a transportation system that once existed and has also been cut from the world of Cyberpunk 2077.

Reddit user Sybekul posted a clip of V standing on an inactive rail line. In the clip, V follows the track to the platform of the Night City Area Rapid Transit (NCART) station and enters through a door. Inside the station are some unfinished rudimentary structures such as ceilings and floors.
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Two years ago, another Reddit user posted a simulation of the Night City train system map seen from one of the first Cyberpunk 2077 trailers. It can be seen that this public transit system was originally part in the game plan.

Adding, removing or removing content is a common occurrence during the development of a project. Some ideas are not worth the effort and time it takes to execute them completely.
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The above transport system may be used in the future, although this is just a guess. Before the launch of Cyberpunk 2077, CD Projekt said the game will have more content for DLC than The Witcher 3. So perhaps in the upcoming Cyberpunk 2077 expansion, players will have the opportunity to travel on monorails.​