Don’t know if this line actually exists but I have heard the PATH (known in the past as the H&M) was originally supposed to connect all of the major Hudson River terminals except for Weehawken. So Hoboken (Delaware Lackawanna and Western), Newport (Erie), Exchange Place (Pennsylvania Railroad which also owned the H&M), and Communipaw Terminal (Central Railroad of New Jersey). The final terminal does not have a PATH station and is currently a part of Liberty State Park.

The junction where the 33rd/Hoboken line splits from the WTC line was originally going to be a four-way junction with the 33rd/Hoboken line continuing south to Communipaw if I recall from a map I saw.