Initially proposed by the Regional Plan Association back in 1996, the so-called "X line" was revived just before the last mayoral election. The Triboro RX doesn't seem to be on de Blasio's radar, but by connecting the Bronx, Queens, and Brooklyn it would accomplish his stated mission of transit equity for the outer boroughs. Preliminary ridership estimates suggest it could carry upwards of 76,000 a day, with much of the right-of-way already secured. As Jeff Zupan of RPA told us in 2013, the Triboro RX "has all the makings of being a real winner."
Read the full article in City Lab.