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90.5 WESA's Good Question! series is an experiment where you bring us questions—and we go out to investigate and find answers.So: What have you always wondered about Pittsburgh? Are you curious how your neighborhood originally received its name? Or maybe why the Mon and Allegheny Rivers are different colors when they merge at the Point? Or maybe you've always wanted to know what happened to all of our street cars and inclines? From serious to silly, we're here to help.

Where Do The Abandoned Third Set Of Tracks At Steel Plaza Lead?

Riders on Pittsburgh’s Light Rail T system at Steel Plaza station may have noticed four tracks: one goes inbound, one goes outbound and two veer off to the east. But signs for the two east-bound tracks have been covered or removed and trains don't use them.


Credit Katie Blackley / 90.5 WESA
90.5 WESA
Two tracks at Steel Plaza no longer in operation. They used to lead to and from Penn Station, which would connect riders from Grant Street and Oliver Avenue downtown to the Martin Luther King Jr. East Busway at Grant Street and Liberty Avenue.

The purpose of these tracks was the subject of listener Greg Null’s Good Question! submission. Null said he rides the T from his Dormont home each day and wondered about the abandoned tunnel.

“Where do those tracks go?” he asked.

The track and the tunnel have been in Pittsburgh a long time. It was once part of the Pittsburgh & Steubenville Extension Railroad. The tunnel was originally a part of the Pennsylvania Canal system, which was constructed in the 1830s. It carried passengers from the eastern U.S. to the then-unexplored western states, passing through Pittsburgh.

Engineering Pittsburgh: A History of Roads, Rails, Canals, Bridges and More by the American Society of Civil Engineers described the route of the canal downtown:

The canal ran along the east side of Grant Street. It then curved to the left under what is now the U.S. Steel Building to enter a tunnel under Grant's Hill...The tunnel was built by cut and cover. This was confirmed when engineers for the Allegheny County Port Authority drilled exploratory core holes in the 1980s for design of the Light Rail Transit line to the south of Pittsburgh.


Credit Hopkins Maps
A 1862 map of the city of Pittsburgh. The top purple arrow points to the aqueduct constructed over the Allegheny River to connect the Pennsylvania Canal to the Monongahela River. The middle purple arrow shows the tunnel's alignment downtown, which is more east than the current underground tunnel where the T runs.

Through its system of interlocking water channels, railways and inclined planes, the Pennsylvania Canal is credited with encouraging expansion west. But between the 1860s and 1900 most of it was replaced by the Pennsylvania Railroad (PRR), which could move across the state faster than the canal network. 


Around that time, the Panhandle Bridge was built across the Monongahela River in Pittsburgh. It was updated to keep pace with the volume of freight passing over it; the current span was built in 1903 and raised about a decade later. Several railroad companies used it as an access point to downtown Pittsburgh until Port Authority of Allegheny County (PAT) expressed interest in it in the 1980s. That’s when the agency was planning to replace the old trolley lines that ran across the Smithfield Street Bridge with the modern light rail (known as the T). PAT Program Manager of Service Planning Fred Mergner said the historic span wasn’t structurally sufficient for the larger, newer vehicles.

“One of the big dilemmas was: okay, how do we put an 82-foot car on Smithfield Street between Third Avenue and the Boulevard of the Allies?” Mergner said. “They were little things that weighed in as they went from the long list to the short list.”


This is part of our Good Question! series where we investigate what you've always wondered about Pittsburgh, its people and its culture.

 Planners then turned their attention instead to the Panhandle Bridge for the new T. PAT purchased the old canal-turned-rail tunnel that was connected to the bridge 

By using this path, the T could use the old rail tunnel to go under the Allegheny County Courthouse (then the jail), and then stop at Steel Plaza at Sixth Avenue and Grant Street. From there the T could take one of two paths: continue on to Penn Station using the former railroad tunnel, or go to the new Wood Street Station. At Penn Station, riders could board a local PAT bus, Greyhound or train.

Credit Katie Blackley / 90.5 WESA
90.5 WESA
Port Authority's T line near the end of the tracks by Penn Station. The tracks used to bring passengers to and from Steel Plaza, but due to low ridership, it was closed in 2007. The track actually runs underneath part of the U.S. Steel building. Now, the space is a stop along the East Busway.


At Steel Plaza, the Port Authority started digging.


“When they built Steel Plaza, I’m pretty sure they just dug the whole ground out,” Mergner said. “You could actually stand on Grant Street and look down and see the box of the station before they covered it over.”

They also dug a tunnel west underneath Sixth Avenue to Wood Street Station, which was in the lower floors of the Max Azen Furs building.


Credit Hopkins Maps
A 1910 map of where the Steel Plaza T station is now, near the corner of Grant Street and Oliver Avenue downtown. Now, the station is near the BNY Mellon Building and Mellon Green.

Meanwhile, the existing former railroad tunnel was modified to head south from Penn Station to Steel Plaza, according to former Pittsburgh Post-Gazette and Pittsburgh Press transit writer Joe Grata. But the route proved to be unpopular.

“It was short-lived because no one ever really rode it,” Grata said. “It was never really promoted as a transfer point to downtown, but then again, you didn’t have the opportunity to go to the North Shore at that particular point.”

Around 2007, Port Authority finally shut down the tunnel route from Penn Station to Steel Plaza due to low ridership. Today, that third track is used as a standby location for trains on very busy days, like Steelers games and parades. It was also used this past October when the city hosted the annual Rail-Volution conference. The tracks behind Penn Station are closed to the public, but still visible to people waiting for a ride on the busway.