[Underneath the Sixth Avenue El.]
[Sixth Avenue El.]
[Sixth Avenue El, Rector Street station.]
[Sixth Avenue El, Rector Street.]
[Sixth Avenue El train station.]
[Bifurcation of the Sixth and Ninth Avenue Els.]
[Demolition of the Sixth Avenue El.]
[Sixth Avenue El, Cortlandt Street.]
[Convergence of the Sixth Avenue and Ninth Avenue El train tracks.]