22nd Street
22nd Street station under the I-280 viaduct in November 2017
General information
Location	1149 22nd Street San Francisco, California
Coordinates	37°45′26″N 122°23′33″W / 37.75722°N 122.39250°W / 37.75722; -122.39250
Owned by	Peninsula Corridor Joint Powers Board
Line(s)	Peninsula Subdivision[1]
Platforms	2 side platforms
Tracks	2
Connections	Muni: 48, 55
Construction
Structure type	Below-grade
Parking	Street parking
Bicycle facilities	27 racks, lockers, Bay Wheels station
Accessible	No
Other information
Fare zone	1
History
Opened	1907 (1907)
Previous names	23rd Street
Original company	Southern Pacific
Passengers
2018	1,977 per weekday[2]  11.5%
Services
Preceding station Caltrain Following station San Francisco Terminus Local (L1) Bayshore toward San Jose Diridon or Tamien Weekend Local (L2) Limited (L3) (reverse peak) Millbrae toward San Jose Diridon, Tamien or Gilroy Limited (L4) San Bruno toward San Jose Diridon, Tamien or Gilroy Limited (L5) Millbrae toward San Jose Diridon or Tamien Baby Bullet (B7) (reverse peak) Millbrae toward San Jose Diridon
Former services Preceding station Southern Pacific Railroad Following station San Francisco Terminus Coast Line Bayshore toward Los Angeles Peninsula Commute Paul Avenue toward San Jose Del Monte Paul Avenue toward Monterey
Location

22nd Street station is a Caltrain commuter rail station located south of 22nd Street between the Dogpatch and Potrero Hill neighborhoods of San Francisco, California beneath the Interstate 280 freeway viaduct. The only below-grade Caltrain station, it is bracketed on the north and south by two tunnels which take the line under the eastern slope of Potrero Hill. The station is also served by Muni routes 48 and 55.^[3]

The station opened when the Southern Pacific Railroad built the Bayshore Cutoff in 1907. The station was originally known as 23rd Street.^[4] The former wooden stairways were replaced with metal stairs in 2007.^[5]

The station is reached only by stairways from 22nd Street and Iowa Street — there are no ramps or elevators between the platforms and street level — and is thus not accessible.^[6][5] The narrow stairways create bottlenecks, especially when northbound trains arrive.^[5] A December 2021 study recommended the installation of ramps as an interim accessibility measure pending future reconstruction or relocation.^[7]

Under the Pennsylvania Avenue alternative of the Downtown Rail Extension project, Caltrain tracks would be placed in a new tunnel north of 22nd Street. The existing station would be replaced by a new station, either at the existing site, or potentially north at Mariposa Street or south at Cesar Chavez Street.^[8]