The Freedom Tunnel is the name given to the railroad tunnel on the West Side Line under Riverside Park in Manhattan, New York City. Used by Amtrak trains to and from Pennsylvania Station, it got its name because the graffiti artist Chris "Freedom" Pape used the tunnel walls to create some of his most notable artwork. The name may also be a reference to the former shantytowns built within the tunnel by homeless populations seeking shelter and freedom to live rent-free and unsupervised by law enforcement. The tunnel runs approximately , from 72nd Street to 124th Street. History The tunnel was built by Robert Moses in the 1930s to expand park space for Upper West Side residents – although the construction of Moses's Henry Hudson Parkway in the same area effectively blocked access to the river. After it was completed, the tunnel was used for freight trains until 1980, when regular operations ended. The railroad favored using yards in the Bronx and New Jersey, and increased use of trucking led to the demise of the West Side Line. The giant, man-made caverns became a haven for homeless people. At its height in 1994, nearly a hundred people lived in the tunnel. On April 4, 1991, the tunnel was reopened for trains of the Amtrak Empire Connection, and a massive eviction followed. The shantytowns were bulldozed and the tunnel was chained off. To this day, however, graffiti artists and urban explorers continue to visit the tunnel, while the homeless population has been mostly displaced. Around 2014 and 2015, graffiti artists and urban explorers were sporadically caught and escorted out by Amtrak Police. Artwork Over the tunnel's years of disuse, its isolated nature allowed graffiti artists and street artists to work without fear of arrest, leading to larger and more ambitious pieces. The tunnel has unique lighting provided by grates in the sidewalks of Riverside Park above the space. The descending shafts of light allow graffiti art to be seen in the gloom, and artists would often center their projects under the light to take advantage of the spot-lighting effect, as if in a gallery. After achieving popularity in the book Spraycan art by James Prigoff and Henry Chalfant, graffiti artists began to flock to the Freedom Tunnel and gained access through a series of broken gates near 103rd Street and Riverside Park. Early artists who left their mark on the tunnel