Work continued to finish off the interior of the tubes. The finishing touches included the addition of a concrete lining, which replaced the original brick lining, as well as laying tracks and electric third rails; this took an additional year to complete. The stations on the Manhattan side were also completed during this time.
Work continued to finish the interior of the tubes. The finishing touches included adding a concrete lining that replaced the original brick lining, as well as laying tracks and electric third rails; this took longer than expected. Station construction on the Manhattan side was also completed during this time frame.