The approximately 1,200-foot-long (370 m) station, designed by Dattner Architects, has a single wide island platform serving two tracks, as well as eight staircases between the lower mezzanine and the platform.
The platform itself is 35 feet (11 m) wide, which makes it much wider than many other island platforms in the subway system; by comparison, the Chambers Street station in Lower Manhattan has platforms that are 18.5 feet (5.6 m) wide, and the Second Avenue Subway stations are 27.8 feet (8.5 m) wide.
The platform, at 585 feet (178 m) long, is among the longest in the IRT system, as well as the longest "column-free" platform of any station in the system.

The station's extreme depth necessitates an upper (fare) mezzanine and a lower (passenger) mezzanine at both entrances.
The main entrance, at 34th Street, contains 27.6-foot-deep (8.4 m) fare mezzanine located under the basement of 55 Hudson Yards.
Escalators and an incline elevator lead to the lower mezzanine, which is 109 feet (33 m) deep.
An additional upper mezzanine at 35th Street is located at the same depth, but is not connected to the 34th Street mezzanine.
Both upper mezzanines lead to a full-length passenger mezzanine above the platform.
Above the lower mezzanine is a curved, oval-shaped ceiling indentation that helps to cover the ventilation tubes in the station ceiling, and also acts as a skylight.
The curved, cavernous ceiling of the lower mezzanine helps the station be energy-efficient via the use of indirect lighting.
 The Empire Connection and North River Tunnels are both located above the station's lower mezzanine.

The station contains a total of 16 escalators: nine between the upper and lower mezzanine levels, and seven between the street and upper mezzanine levels.
Nine of these escalators are only reachable from the main entrance at 34th Street, while seven are only reachable from the secondary entrance at 35th Street.
At the main entrance, four escalators and two stairs lead from street level to that entrance's upper mezzanine.
Past the main entrance's fare control, which is split into two banks, there are two parallel shafts down to the lower mezzanine.
The northern shaft carries four escalators, while the southern shaft carries one up-only escalator and the two incline elevators.
The secondary entrance contains an additional three escalators and a stair between the street and that entrance's upper mezzanine.
Past the turnstiles, a single bank of four escalators leads to the lower mezzanine.
While the main entrance's escalator shaft to the lower mezzanine is column-free, the secondary entrance's corresponding escalator shaft contains supporting columns in the center, between the inner two escalators.
The lowermost escalators between the mezzanines are the system's longest and take about one minute and thirty seconds to traverse.

The station also contains four elevators, all of which are only accessible via the main entrance.
Two elevators travel vertically: one from street level to the upper mezzanine, and one from the lower mezzanine to platform level.
The other two are incline elevators, traveling diagonally in the shaft between the main entrance's upper mezzanine and the lower mezzanine.

The walls adjacent to the tracks have white tiles arranged in sets of three 15-foot (4.6 m) columns of 3 tiles each.
There are two-tile-high gray squares containing white "34"s in the middle of each set of columns.
They are pre-fabricated porcelain panels, in three-by-five slabs, to allow easy replacement.
On the lower mezzanine, the architects used high ceilings and convex railings to make the station seem bigger, thus improving passenger flow.
A tiling pattern, similar to that used on platform level, is also used on the lower mezzanine, though electronic advertisement panels are mounted on the walls at certain areas along the lower mezzanine.
The cavernous station's design has been compared to that of Washington Metro stations, although early plans for narrow, Washington Metro-like platforms were scrapped.
The station has also been compared to stations alon
The approximately 1,200-foot-long (370 m) station, designed by Dattner Architects, has a single wide island platform serving two tracks, as well as eight staircases between the lower mezzanine and the platform. The platform itself is 35 feet (11 m) wide, which makes it much wider than many other island platforms in the subway system; by comparison, the Chambers Street station in Lower Manhattan has platforms that are 18.5 feet (5.6 m) wide, and the Second Avenue Subway stations are 27.8 feet (8.5 m) wide. The platform, at 585 feet (178 m) long, is among the longest in the IRT system, as well as the longest "column-free" platform of any station in the system.
The station's extreme depth necessitates an upper (fare) mezzanine and a lower (passenger) mezzanine at both entrances. The main entrance, at 34th Street, contains 27.6-foot-deep (8.4 m) fare mezzanine located under the basement of 55 Hudson Yards. Escalators and an incline elevator lead to the lower mezzanine, which is 109 feet (33 m) deep. An additional upper mezzanine at 35th Street is located at the same depth, but is not connected to the 34th Street mezzanine. Both upper mezzanines lead to a full-length passenger mezzanine above the platform. Above the lower mezzanine is a curved, oval-shaped ceiling indentation that helps to cover the ventilation tubes in the station ceiling, and also acts as a skylight. The curved, cavernous ceiling of the lower mezzanine helps the station be energy-efficient via the use of indirect lighting.  The Empire Connection and North River Tunnels are both located above the station's lower mezzanine.
The station contains a total of 16 escalators: nine between the upper and lower mezzanine levels, and seven between the street and upper mezzanine levels. Nine of these escalators are only reachable from the main entrance at 34th Street, while seven are only reachable from the secondary entrance at 35th Street. At the main entrance, four escalators and two stairs lead from street level to that entrance's upper mezzanine. Past the main entrance's fare control, which is split into two banks, there are two parallel shafts down to the lower mezzanine. The northern shaft carries four escalators, while the southern shaft carries one up-only escalator and the two incline elevators. The secondary entrance contains an additional three escalators and a stair between the street and that entrance's upper mezzanine. Past the turnstiles, a single bank of four escalators leads to the lower mezzanine. While the main entrance's escalator shaft to the lower mezzanine is column-free, the secondary entrance's corresponding escalator shaft contains supporting columns in the center, between the inner two escalators. The lowermost escalators between the mezzanines are the system's longest and take about one minute and thirty seconds to traverse.
The station also contains four elevators, all of which are only accessible via the main entrance. Two elevators travel vertically: one from street level to the upper mezzanine, and one from the lower mezzanine to platform level. The other two are incline elevators, traveling diagonally in the shaft between the main entrance's upper mezzanine and the lower mezzanine.
The walls adjacent to the tracks have white tiles arranged in sets of three 15-foot (4.6 m) columns of 3 tiles each. There are two-tile-high gray squares containing white "34"s in the middle of each set of columns. They are pre-fabricated porcelain panels, in three-by-five slabs, to allow easy replacement. On the lower mezzanine, the architects used high ceilings and convex railings to make the station seem bigger, thus improving passenger flow. A tiling pattern, similar to that used on platform level, is also used on the lower mezzanine, though electronic advertisement panels are mounted on the walls at certain areas along the lower mezzanine. The cavernous station's design has been compared to that of Washington Metro stations, although early plans for narrow, Washington Metro-like platforms were scrapped. The station has also been compared to stations alon
34th Street–Hudson Yards station