The MTA has a similar 2D version of this on their website, divided into the "Neighborhood Maps," which are also posted in some stations[1, 2]. Apple maps has had this for the New York City Subway for a while[3], and Google is adding it but still doesn't have the entrances/exits like Apple Maps has (which are very helpful!)[4].
[1]: http://web.mta.info/maps/neighborhood_maps.htm
[2]: http://web.mta.info/maps/neighborhoods/mn/M12_MidtownEast-Gr...
[3]: https://i.imgur.com/nDsEOIP.png
[4]: https://i.imgur.com/Mc0WTAc.png