There is a mezzanine above the Lexington Avenue Line's platforms, which have numerous exits to and from Grand Central itself as well as to the streets (see § Exits).
Escalators connect this mezzanine to the Flushing Line, although there are also staircases and passageways directly between the Lexington Avenue and Flushing Lines' platforms.
The Flushing Line platform also has its own exit at its extreme eastern end, though all other exits are through the Lexington Avenue Line platforms and mezzanine.
Outside the Lexington Avenue Line mezzanine's fare control, there are stairs, escalators, and an elevator to Grand Central.
An east-west passageway connects the Lexington Avenue Line's mezzanine to the 42nd Street Shuttle, which also has its own dedicated entrance and exit stairs.
Except for the 42nd Street Shuttle (which is inaccessible at its other station at Times Square), the whole station is handicapped accessible, as is the connection to Grand Central Terminal.

The station has undergone various renovations since the 1980s—when the first major renovation was carried out—but some of the passages and other components still require repair or renovation.
At the same time, a project was ongoing to air cool the station in conjunction with Metro-North Railroad's project to cool Grand Central Terminal.
However, as of 2006, only the Lexington Avenue Line station is air-cooled.
The Lexington Avenue Line station is one of a very small number of artificially cooled stations in the New York City Subway.
The Flushing Line platforms have been equipped with fans, but not an air-cooling system.

In 2014, the Metropolitan Transportation Authority installed an online, interactive touchscreen computer program called "On The Go!
Travel Station" (OTG) in Grand Central.
The self-updating kiosks allow people to route their trips and check for delays.
The MTA set up the map as part of a pilot project in five subway stations.
It lists any planned work or service changes, as well as information to help travelers find nearby landmarks and addresses.
There is a mezzanine above the Lexington Avenue Line's platforms, which have numerous exits to and from Grand Central itself as well as to the streets (see § Exits). Escalators connect this mezzanine to the Flushing Line, although there are also staircases and passageways directly between the Lexington Avenue and Flushing Lines' platforms. The Flushing Line platform also has its own exit at its extreme eastern end, though all other exits are through the Lexington Avenue Line platforms and mezzanine. Outside the Lexington Avenue Line mezzanine's fare control, there are stairs, escalators, and an elevator to Grand Central. An east-west passageway connects the Lexington Avenue Line's mezzanine to the 42nd Street Shuttle, which also has its own dedicated entrance and exit stairs. Except for the 42nd Street Shuttle (which is inaccessible at its other station at Times Square), the whole station is handicapped accessible, as is the connection to Grand Central Terminal.
The station has undergone various renovations since the 1980s—when the first major renovation was carried out—but some of the passages and other components still require repair or renovation. At the same time, a project was ongoing to air cool the station in conjunction with Metro-North Railroad's project to cool Grand Central Terminal. However, as of 2006, only the Lexington Avenue Line station is air-cooled. The Lexington Avenue Line station is one of a very small number of artificially cooled stations in the New York City Subway. The Flushing Line platforms have been equipped with fans, but not an air-cooling system.
In 2014, the Metropolitan Transportation Authority installed an online, interactive touchscreen computer program called "On The Go! Travel Station" (OTG) in Grand Central. The self-updating kiosks allow people to route their trips and check for delays. The MTA set up the map as part of a pilot project in five subway stations. It lists any planned work or service changes, as well as information to help travelers find nearby landmarks and addresses.
Grand Central–42nd Street station