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.
The work continued to complete the tube interiors. Additional tasks involved installing a concrete lining that replaced the original brick lining, along with setting tracks and electric third rails; this required an extra year to finish. Simultaneously, station construction on the Manhattan side was also completed during this period.