Only some of Hylan's planned lines were built to completion. This was built at a later date.
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Two of them would continue as a Lafayette Avenue, but would then become four tracks. He came up with his own plan.
The line would narrow to three tracks to Broadway. At the line's southern end, a connection would be built to the Eastern Parkway Line near Franklin Avenue via a new set of tubes under the East River.
By the end ofall of these routes were to have been completed.
Then it would turn down to Red Hook. The rationale given was: The line would therefore have to be built to IRT clearances.
A new low-level subway through Manhattan would complete the loop. Southern Boulevard and Westchester Ave.
One branch would run to a loop near City Hall, while the other would go to a new Lafayette Avenue line in Brooklyn, running via Third Avenue and the Bowery. Two major trunk lines in midtown Manhattan, with one running under Eighth Avenue and one under Sixth Avenuewhich already had an elevated line.
The Triborough System was a proclamation for new subway lines to the Bronx and Brooklyn. The extension would have provided access to commuter railroads in New Jersey as most lines converged there, and the lines that didn't would be rerouted to stop there. The remaining two tracks would run to Franklin and Flatbush Avenues.
A new line running under Utica Avenue to Flatlands Avenue. At 10th Street, the line would cease to be a four-track line, with the line splitting into two branches. To connect the outer boroughs, a four-track Brooklyn-Queens crosstown line would be designed, with the possibility for future extensions into the Bronx and Staten Island.