Back in the day, the Allentown Line carried the 52 Streetcar, later known as the Brown Line, over Mount Washington and into Downtown Pittsburgh. Today, the line is maintained as a deviation route for light rail trains that can't use the more direct Mount Washington Transit Tunnel. Here's a full endtoend ride on one!

Sources:

https://www.pittsburghbeautiful.com/2...)

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Classy Whale atleastweekly misadventures with trains and transit!