“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. PAT Program Manager of Service Planning Fred Mergner said the historic span wasn’t structurally sufficient for the larger, newer vehicles. 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). ![]() 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. 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. 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.Īround that time, the Panhandle Bridge was built across the Monongahela River in Pittsburgh. Through its system of interlocking water channels, railways and inclined planes, the Pennsylvania Canal is credited with encouraging expansion west. The middle purple arrow shows the tunnel's alignment downtown, which is more east than the current underground tunnel where the T runs. ![]() The top purple arrow points to the aqueduct constructed over the Allegheny River to connect the Pennsylvania Canal to the Monongahela River. Credit Hopkins Maps A 1862 map of the city of Pittsburgh.
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