 Complete the following phrase:  Even with this expansion, there was a pressing need for growth. In 1922, Mayor John Hylan put out his plan for over 100 miles of new subway lines going to all five boroughs. His plan was intended to directly compete with the two private subway operators, the IRT and the BMT. This plan was never furthered. The next big plan, and arguably the most ambitious in the subway systems history, was the Second System. The 1929 plan by the Independent Subway to construct new subway lines, the Second System would take over existing subway lines and railroad rights-of-way. This plan would have expanded service throughout the city with 100 miles of subway lines. A major component of the plan was the construction of the Second Avenue Subway. The 