The New York City subway system is known worldwide for several reasons. From innovations such as the third rail to air conditioning, the New York subway system has changed subway trains forever.

Opening on October 27, 1904, the world-famous subway system recently celebrated its 120th anniversary. As times have changed, the New York Metropolitan Transit Authority (MTA) and the New York Transit Museum continue to preserve the legacy of the subway while also innovating intercity transportation.

Keeping History Alive

The New York City Subway currently consists of 25 routes, including 472 stations and 800 track miles, but all that infrastructure was built over 120 years.

The original line of the subway, known as the Interborough Rapid Transit, opened on October 27, 1904, with 28 stations and stretched for 9.1 miles from City Hall to Harlem. Construction began roughly five years before opening, making the oldest parts of the subway system 125 years old.

“Maintaining the assets is the biggest challenge for sure,” said John Gasparine, WSP New York transportation lead. “That’s why MTA has such a big state of good repair budget.”

WSP has been involved with the New York City Subway from the beginning, as William Barclay Parsons served as the chief engineer for the Interborough Rapid Transit project. Parsons founded the New York-based Parsons Brinckerhoff, which is a forerunner of WSP.

Apart from WSP, which works on the subway system to this day, the New York Transit Museum helps preserve the history of the railway. Focusing on preserving the history of the subway, the Transit Museum maintains the original City Hall Station, an architectural icon.

As the city has grown and the subway system expanded, some of the original stations have been demolished to make way for new construction. When the original Penn Station was demolished, the importance of historic preservation became apparent.

“Historic preservation became a very big thing in New York and almost everywhere when the original Penn Station was demolished,” said Gasparine. “So now historic preservation permeates almost everything that we do, especially as it relates to the stations. MTA bakes historic preservation into all the original stations and the tunnels themselves as they’re a functional piece of infrastructure, and they’re constantly being maintained.”

While not open to the public, the New York Transit Museum offers rides on vintage train cars through City Hall Station for the 120th anniversary of the subway and every December.

Pushing Technology Forward

To build the Interborough Rapid Transit subway, several technological innovations were implemented, including one that would change the way electric trains work forever. One of WSP’s founders, Henry M. Brinckerhoff, helped invent the third rail in 1894, allowing trains to operate on electricity safely and eliminating any smoke or steam produced by steam engines.

“Henry M Brinckerhoff helped invent third rail electrification of passenger trains as we know them today,” said Gasparine. “He helped eliminate the smoke that would otherwise be coming from a locomotive in those enclosed spaces. He also helped General Parsons create the first steel subway cars, a move away from wooden chassis. It resulted in longer-lasting, safer vehicles.”

The construction of the tunnels also utilized new technology that enabled engineers to build the City Hall station without disrupting the building above. The various blasting techniques used in tunnel construction revolutionized underground work in urban areas.

As the subway system grew, safety systems that allowed operators to track the location of all subway trains became necessary. 

Following the trend of pioneering new technologies, such as an interlocking block system with automatic trippers overlapping track circuits, the trains themselves were among the first to feature a train stop in the cab that automatically stopped the train if an operator removed their hand from the control panel.

With the cold winters and hot summers, the New York Subway was among the first to install air conditioning.

“Over the years, going back to 1955, I think one of the biggest milestones was air conditioning,” said Gasparine. “Making people cool in the summer and warm in the winter. That was a big deal.”

Adapting to Modern Times

The New York Subway is still pushing innovation forward, as they are currently putting a focus on American Disability Act accessibility. Work to make the subway accessible to all is ongoing, with accessibility improvements at stations and on trains often underway.

Recently, New York City has been purchasing new R211 subway cars to address accessibility issues. These cars feature more accessible seating and wider doorways to improve the boarding process.

Updating the subway trains can be a challenge, however, as the 120-year-old infrastructure was designed for older, smaller cars; modern cars and engines have to be considered with these restrictions in mind.

“When you look at the size of the tunnels from the original IRT lines and the radius of the turns, it actually limits how long a train car or the train itself could be, as well as how wide a train can be,” said Gasparine. “So some of the tunnel structure and geometry present constraints on options for how to modernize the subway. Another big challenge is that the original system was built with natural ventilation. This was designed so that when trains are moving through the tube, they push the air ahead of the train, creating a vacuum behind the train that draws in fresh air from at-grade vents. This makes it hard to heat and cool stations mechanically.”

Other Innovations on the Tracks

Keeping riders comfortable and on the move is a big part of any transit system, and one innovation many transit systems still use today did not require any technological advancements.

With a large population wanting to get from one side of New York City to the other, the designers of the New York City subway decided to implement express tracks with fewer stops and less time spent waiting for passengers to get on and off the train. The New York subway system was the first subway to implement an express line.

The Next Big Thing

As technology continues to improve, the New York City subway continues to be at the forefront of implementing new technologies.

By migrating to digital systems, the subway is making real-time passenger information available to everyone, regardless of where they are. Even the train control system is seeing the benefits of going digital with the advent of communication-based train control and laser-based track intrusion detection systems.

The MTA is investing heavily in technology as it becomes more refined, keeping the New York City subway system at the forefront of the industry and innovating wherever it can.