UPDATE (12.07.2020): Post substantially revised for clarity. This update includes a new de-interlining option and image updates.
In my last post, I discussed the South Brooklyn de-interlining. So far, the de-interlining plans contemplated by NYTIP involve simple swaps. In this part, we’ll explore the Broadway (N, Q, R, and W) and Queens Boulevard (E, F, M, and R) lines; while de-interlining the former is trivial, the latter is much more challenging.
Note: Click any image to enlarge.
The Broadway trunk line runs from 57th Street and 7th Avenue to Canal Street in Manhattan. The N and Q make express stops and cross the Manhattan Bridge, while the R and W make local stops and run via Lower Manhattan. Conflicts occur north of 34th Street – Herald Square station when the N joins the R and W on the local tracks; the three services run together until reaching Queens, where the N and W serve Astoria and the R serves Queens Boulevard. Meanwhile, the Q serves the Second Avenue Subway (SAS) via 63rd Street.
[Fig. 1] Snippet of vanshnookenraggen’s track map showing Broadway line conflicts.
This pattern causes delays and restricts N, R, and W service since they share tracks from the 60th Street tunnel to Times Square. To address these issues and improve service on Broadway under NYTIP:
Reroute N trains via the Second Avenue Subway (SAS).
[Fig. 2] Overview of the N reroute, via Brand New Subway.
Under this reroute, the N no longer switches to the local tracks north of 34th Street; instead, it runs with the Q to 96th Street and 2nd Avenue. With only the R and W on 60th Street, there is now room to increase service on both lines to make up for the loss of the N.
While it appears Astoria will lose substantial service, this is actually not the case. In parallel with the N reroute, NYTIP prescribes changes to Queens Boulevard service that will improve service on both the Queens Boulevard and Astoria lines.
II. Queens Boulevard
[Fig. 3] Snippet of the NYC Subway map showing the Queens Boulevard trunk (E, F, M, and R lines) and branches.
The Queens Boulevard (QB) trunk serves three different Manhattan trunk lines and connects to several other lines, making it one of the busiest trunk lines outside of Manhattan. It serves 8th Avenue (E train), 6th Avenue (F and M trains), and Broadway (R train). The E and F run express in Queens, with E trains entering Manhattan via 53rd Street and F trains entering Manhattan via 63rd Street. The M and R run local, with M trains entering Manhattan via 53rd Street and R trains entering Manhattan via 60th Street. The current pattern poses several conflicts:
- The E express and M local merge near Queens Plaza.
- The F express splits from the E west of 36th Street station to serve the 63rd Street line; this switch induces delays on the QB express.
- Forest Hills – 71st Avenue, due to its nature as a relay terminal for the M and R trains, induces delays on the QB local.
[Fig. 4] Illustration of existing conflicts on the QB and Astoria lines.
Unfortunately, addressing these conflicts is not trivial. vanshnookenraggen explored some of these difficulties at length; he proposed sending the R to Astoria and sending the N via 63rd Street to Forest Hills to replace the R. Honestly, I don’t think it’s a bad plan. However, sending both the N and the Q via SAS allows for building both the Cross-Harlem and Bronx extensions of SAS Phase 2 (future post).
The first step in addressing the QB problem is resolving the Astoria problem. To do that:
Reroute R trains via Astoria to Ditmars Blvd.
Rerouting the R addresses the loss of the N beyond the rush hour. The W, if left unchanged, becomes fully contiguous with the R. In this case, all W trains can run as R trains, removing all merges from the R and allowing significant service increases. For de-interlining options requiring a W train reroute, the R receives sufficient service increases to prevent a service cut on the Astoria corridor. More on this later.
One of the main obstacles to running the R to Astoria is the lack of storage space for the R line’s subway cars. The current R serves the QB line for easy access to Jamaica Yard. One way to address this is as follows:
Potential capital investment: construct a new yard within the Con Edison property north of Ditmars Blvd.
[Fig. 5] Potential yard location within the Con Edison property with a provision for a future LaGuardia Airport extension.
Building this yard solves the storage space issue, and building it inside the Con Edison property mitigates residential impacts. It also increases the Astoria line’s capacity since the current terminal is a stub with no tail tracks. Importantly, this investment also serves as an anchor for the oft-discussed Astoria line extension to LaGuardia Airport. Although Governor Cuomo’s proposed LaGuardia AirTrain keeps chugging along, it does not obviate the need for the Astoria extension. I’ll discuss this further in a future post.
Now, what if this yard isn’t built? Can we still de-interline Astoria and South Brooklyn in a way that gives the R direct yard access? Find out by reading this blog post!
Before I get into QB de-interlining options, allow me to discuss an investment that could enhance service under all options:
Potential capital investment: construct an in-system transfer connecting the Queens Plaza and Queensboro Plaza stations.
This transfer will give Queens riders some flexibility; however, it is not trivial – Queens Plaza is underground, while Queensboro Plaza is above ground. Nevertheless, this could serve as a key transfer point for eventual access to LaGuardia Airport. This investment is optional under NYTIP.
Now, let’s explore the possible de-interlining options for the QB line, and the underlying challenges in each.
Option 1a: Partial de-interlining with G extension
[Fig. 6] Overview of Option 1a.
[Fig. 7] Option 1a track map showing conflicts eliminated through partial de-interlining.
Under Option 1a, the G runs with full-length (600-foot) trains instead of 300-foot trains and extends to Forest Hills to replace the R. The F and M switch alignments west of 36th Street station, with the F running via 53rd Street and the M running via 63rd Street; this swap removes conflicts with the E. As an optional enhancement, the G and/or M can extend to Jamaica – 179th Street, allowing the F to run express east of Forest Hills.
Option 1b: Partial de-interlining with R/W swap
[Fig. 8] Overview of Option 1b.
Option 1b, like Option 1a, sends the F via 53rd Street and the M via 63rd Street to remove a conflict with the E. Rather than extending the G train, Option 1b prescribes an R/W swap in Queens, with R trains running to Astoria and the W replacing the R on the QB line. When combined with the South Brooklyn de-interlining, this option ensures all routes have direct access to at least one storage yard. An optional enhancement is extending the W to Jamaica – 179th Street to allow F express service east of Forest Hills. (This option does not preclude full-length trains on the G – an investment NYTIP recommends.)
Full De-Interlining Options
So long as the QB line serves more than two trunks or branches, full de-interlining is not possible. Furthermore, full de-interlining requires some level of capital investment. The Regional Plan Association, in their Save our Subways publication, tries to get around this by rerouting the M via the J line to Broad Street. This leaves QB with only the E express via 53rd Street and the F local via 63rd Street. RPA suggests doubling both E and F service to preserve service levels. (While an M reroute isn’t necessary for full QB de-interlining, some options will require reinstating the brown M, as RPA suggests.)
Before exploring full de-interlining options, let’s discuss the tunnels to Manhattan. The 53rd Street tunnel connects to 6th Avenue and 8th Avenue, while the 63rd Street tunnel connects to 6th Avenue and Broadway; the latter includes a provision for a future 2nd Avenue connection. Since the 53rd Street tunnel is the only tunnel connecting Queens to 8th Avenue, all 8th Avenue service should serve 53rd Street and all 6th Avenue service should serve 63rd Street. This leaves the following options:
Option 2: 6th Avenue service express, 8th Avenue service local
[Fig. 9] Overview of Option 2.
[Fig. 10] Option 2 track map showing eliminated conflicts.
Option 2 fully de-interlines the QB line. Under Option 2, the E runs local while the F and M run express. When combined with the Central Park West de-interlining, the E under Option 2 no longer conflicts with any other line, allowing for significant service increases. However, this option presents several issues. First, the E’s current southern terminal – World Trade Center – is a stub-end terminal with no tail tracks, limiting capacity. Absent new tail tracks (possibly using the Worth Street subway provision), this option becomes untenable due to the potential capacity crunch on 53rd Street. While the 8th Avenue line has stubs south of Penn Station and south of Canal Street, each one requires crossing over the express tracks and is thus undesirable.
The second issue is the M’s short length. All QB services use 600-foot trains except the M, which uses 480-foot trains. At present, the QB express service runs about every 2 minutes at peak hours with full-length trains. While de-interlining allows service increases on the M, its short trains result in a net loss in capacity – another untenable situation. (Running full-length M trains requires platform extensions at every station from Essex Street to Middle Village.) A third issue is ease of access to 6th Avenue from the local stops west of Jackson Heights. Since the F and M diverge east of the next express stop (Queens Plaza), these passengers lose direct access to 6th Avenue.
Of these three issues, only one is solvable without capital investment – the last one. From west of Jackson Heights, riders can connect to 6th Avenue by making a cross-platform transfer at 7th Avenue – 53rd Street to the B/D.
Option 3: 6th Avenue service local, 8th Avenue service express
[Fig. 11] Overview of Option 3 with the new K line.
[Fig. 12] Option 3 track map showing eliminated conflicts.
Option 3 also fully de-interlines the QB line. Under Option 3, the F and M run local and the E runs express. Owing to the capacity limitations of the World Trade Center terminus, Option 3 prescribes a new K line. The K originates from Jamaica – 179th Street station and runs express with the E. Together, the E and K make the same stops from Kew Gardens to Canal Street in Manhattan; the E continues to the World Trade Center as normal, while the K takes the Worth Street subway to a new terminal at Grand Street:
[Fig. 13] Overview of the Worth Street subway.
The K serves three new stations at Chatham Square (the site of a future Second Avenue Subway station), Rutgers Street, and Grand Street.
As is clear, Option 3 requires more capital investment than Option 2; one way to reduce costs is building just the first of the three stations on Worth Street, or simply building tail tracks using this provision. Option 3 also presents some issues:
- The F, as a local train, becomes the longest local train in the system with 54 stops end-to-end.
- Unlike Option 2, local riders west of Jackson Heights have no opportunity to transfer to 8th Avenue service unless they ride back to Jackson Heights.
A capital solution to the second issue exists. With the R rerouted to Astoria and only 6th Avenue and 8th Avenue services on the QB line, there is now room on the 11th Street Cut west of Queens Plaza to connect the local tracks to the 63rd Street line:
[Fig. 14] Potential track connection from the 11th Street Cut to the 63rd Street line.
With this track connection, 6th Avenue trains can serve Queens Plaza directly before accessing the 63rd Street line, mitigating transfer issues and increasing service at Queens Plaza. (Note that it is also possible to build this track connection under Option 2.)
I will explore potential service patterns for the Worth Street subway in a follow-up post.
Recommended path forward: Option 1b. For immediate improvement, NYTIP recommends Option 1b in the short term as “Phase 1” of the QB de-interlining. This option removes some merging conflicts while preserving direct access to the Broadway, 6th Avenue, and 8th Avenue corridors. I will explore further improvements in a follow-up post.
In my next post, I’ll address the Brooklyn IRT (2, 3, 4, and 5 lines). Until next time!