Through-Running Works
Only If the Contract Requires It
In 2021, agencies argued that rebuilding Penn Station for through-running was structurally impossible. The October 2024 feasibility work complicated that claim by carrying modified in-footprint concepts through engineering review, while rejecting them under operating assumptions that remain disputed. The question now is whether the May 2026 master developer process preserves through-running readiness or locks in another terminal plan before the full public record is available.
A Century-Old Bottleneck Meets a 21st-Century Solution
For years, the region pursued flawed capacity expansion. The agencies insisted on Penn South — a $16.7 billion plan to demolish the block and a half south of Penn Station to build more inefficient stub-end tracks. Advocates argued that Penn Station's real problem was not a shortage of tracks, but the terminal operating model itself.
Following immense public pressure and the undeniable engineering math of the 2024 Feasibility Report, leadership has finally pivoted. In August 2025, Andy Byford confirmed he will promote through-running and drop interest in the destructive Penn South expansion.
The solution we've advocated for is now the stated path forward. Converting Penn Station to a through-running operation connects the Gateway Hudson tunnels directly to the East River tunnels—doubling effective capacity, widening platforms to safe dimensions, and eliminating the terminal-delay mechanism entirely.
The Transparency Mandate
The public record is still incomplete. Advocates including Samuel Turvey, Chairperson of ReThinkNYC, are demanding release of the capacity data and operating assumptions behind the current procurement. The practical question is how many trains per hour each iteration can reliably generate, and whether the master developer contract preserves the option to test that question before the design is locked.
- One 5-minute disruption cascades to 10–15 additional trains
- 193 peak-period trains must reverse direction at interlockings
- 20 ft average platforms fail ADA and create dangerous crowding
- Long dwells force trains into yard storage between runs
- It required $16.7 billion and neighborhood demolition
The Scorecard Behind the Dispute
Before leadership adopted through-running, the old guard tried to kill Alternative 2, Design Concept 2 (decking over alternate tracks for 35-foot platforms). But their own engineers gave the proposal passing marks on structural feasibility.
How Earlier Objections Changed
Before Andy Byford's 2025 pronouncement, the agencies relied on three overlapping arguments to justify demolishing Block 780. Here is how advocate pressure deconstructed each one.
How the Narrative Changed from 2021 to 2024
Proponents of Penn South relied for years on the MTA-commissioned WSP White Paper on Through-Running (2021) claiming that widening platforms within the existing station was structurally impossible and required unacceptable track outages. In their 2024 report, the railroads completely reversed themselves on ReThinkNYC's Design Concept 2.
"Simply covering over selected tracks to widen existing platforms would result in rows of columns immediately adjacent to tracks, which does not meet ADA standards. Properly widening platforms would entail major structural reframing… expected to require continuous removal of 3 to 6 station tracks for extended time periods and is not considered feasible."
"Platform widening is feasible to construct with manageable construction-related service disruption. Selective column relocation along the edges of the widened existing platforms could allow the new platforms to access trains on both sides… If necessary, one side of a track could be fenced off to allow boarding only from the other platform to ensure ADA-compliant access."
"In summary, this concept is considered feasible from a constructability standpoint… The required demolition, trackwork, concourse and platform vertical circulation improvements could be implemented in phases, one platform at a time, minimizing disruption to train movements."— Oct 2024 Feasibility Study, Section 5.2.2.5
The takeaway: Every structural objection raised in 2021 was quietly retracted in 2024. The platform deck-over scheme passes engineering. This forced leadership to acknowledge the physical reality.
Failing the Concept on Purpose: The Operational Sabotage
Having lost the engineering argument in 2024, the old guard failed Design Concept 2 on "Operational Performance." They evaluated a modern 12-track station design using nineteenth-century operating procedures — then declared the modern design inadequate. Advocates exposed this immediately.
The report assumes Amtrak trains must dwell 20–30 minutes, whether through-running or terminating. A modern station cannot function with 30-minute layovers. These reflect crew-change and food-restocking procedures that must be relocated to line endpoints.
The agencies assumed Empire and Hudson Line trains must "turn back" at Penn Station platforms — consuming platform time — rather than running through to revenue endpoints in Queens and New Jersey. This is a policy choice, not an engineering constraint.
The report claimed through-running "sacrifices reverse-peak suburban service" because trains flowing east consume tunnel slots. This is only true if branches are not paired across the region. A genuinely integrated network pairs NJ branches with NY/CT branches, generating reverse-peak ridership both ways.
"The relatively long dwell times required for Amtrak trains… and the requirement to turn back Empire/Hudson Line trains at Penn Station… result in demand for platform track space that exceeds the supply."— Oct 2024 Feasibility Study (Debunked by modern operations models)
The "Tens of Billions in Network Costs" Strawman
To justify a $16.7 billion real-estate land-grab, Section 5.2.3 of the 2024 report outlined "Network Investment Requirements" outside Penn Station, concluding that through-running requires "tens of billions systemwide." Look closely at what those costs actually include:
- Expanding the Hell Gate Line to four tracks
- Grade-separating tracks at Shell Interlocking in New Rochelle
- Building the 5th track on the LIRR Main Line to Jamaica
- Double-tracking the Port Washington, Hempstead, and Long Beach LIRR branches
- Electrifying NJ Transit's Raritan Valley Line and Main Line
- Procuring entirely new, FRA-compliant unified rolling stock for the full tri-state network
Every project on that list is a system-wide State of Good Repair or regional expansion investment that the tri-state network desperately needs regardless of whether Penn Station runs trains through or turns them around. Lumping the cost of modernizing the entire regional rail system onto the Penn Station through-running alternative was a deliberate accounting tactic.
The Penn Station through-running decision is correctly evaluated on the cost of fixing the station — approximately $9.5 billion for the ReThinkNYC Penn Station work — not on the cost of every deferred capital project across three states.
The Numbers That Demand Transparency
Three datasets from the 2021 WSP White Paper that agencies used to argue against through-running — and why each one supports the new plan.
Existing Tracks & Platform Widths (Figure A-3)
Penn Station's 21 tracks serve 11 platforms. A modern high-capacity station requires at least 35 feet on average for ADA compliance, level boarding, and rapid passenger clearing. The existing station fails this standard almost universally.
| Platform | Tracks Served | Vertical Elements | Nominal Width | Assessment |
|---|---|---|---|---|
| 1 & 2 | 1, 2, 3, 4 | 10 each | 20–22 ft | Stub-ended (NJT only). Cannot support through-running due to East Side conflicts. |
| 3, 4, 5 | 5, 6, 7, 8, 9, 10 | 10–14 | 19–20 ft | Narrow width forces the "Swiss Cheese" effect — fragmented staircases, ADA failure, and extreme boarding times. Decking over every other track allows 35-foot platforms on average across the station. |
| 6 | 11 & 12 | 14 | 17 ft ⚠ | |
| 7 & 8 | 13, 14, 15, 16 | 14 | 20 ft | |
| 9 | 17 | — | 20 ft | Narrow center platform. Low utilization. |
| 10 | 18 & 19 | 10 | ~20 ft (Avg Exception) ✓ | LIRR-only, feeds West Side Yard. Currently the only exception to average width. |
The narrowest platform in the station (Platform 6 at 17 feet) is below the width of a typical sidewalk. This is not a through-running problem — it is the problem through-running solves.
Scheduled Dwell Times at Penn Station (Figure A-4)
The binding capacity constraint is not the number of tracks — it is how long trains sit idle. Every minute a train occupies a platform is a minute no other train can use it. The comparison below makes the case for through-running more powerfully than any advocacy document:
(NYC Area)
(Regional Service)
(Originating/Terminating)
(Originating/Terminating)
(Through-Running)
London's Elizabeth Line achieves 24 trains/hour/direction on just 2 tracks with 3-minute dwells. With 12 tracks and a 6-minute dwell standard for commuters (10 minutes for Amtrak), Penn Station has capacity for far more service than agencies used to claim.
Peak-Hour Train Movements (Table A-2)
The agencies argued that because 193 commuter trains turn around in peak periods, and 111 run through to storage yards, through-running required impossible yard expansions. The answer is straightforward: stop running trains to yards. Run them to Queens and New Jersey in revenue service.
| Railroad | AM Peak Behavior | PM Peak Behavior | Through-Running Solution |
|---|---|---|---|
| LIRR | 64 turn around 36 run through (empty) 28 reverse direction |
89 depart outbound 35 pull from storage 54 reverse direction |
Pair LIRR branches with NJ Transit branches. Trains run continuously NJ→Penn→Queens in revenue service. |
| NJ Transit | 39 turn around 21 run through (empty) |
55 depart outbound 19 pull from storage 36 reverse direction |
Pair NJ branches with LIRR/Metro-North. Sunnyside yard trips replaced with revenue through-service to Long Island. |
| Amtrak | 28 operate through | 31 operate through | Reduce dwell to 10 min. Relocate crew changes to endpoints. |
The system is artificially constrained by interlockings A, C, and JO. Eliminating turn-backs removes the conflict movements that cause cascading delays. One 5-minute disruption currently affects 10–15 downstream trains and over 10,000 passengers.
The $16.7 Billion Reality Check vs. Penn South
The agencies used to argue that relocating structural columns made the through-running option impractical, yet they found $16.7B acceptable for a demolition project. The recent policy pivot correctly identifies that Penn South leaves all existing platform width problems unresolved and does nothing to address the terminal operating model.
Spending $9.5 billion to fundamentally modernize the existing station, and $29.4 billion for the full buildout of the transit hubs beyond Penn Station, delivers a return on investment that no amount of new terminal tracks can match.— ReThinkNYC RUN Proposal, Economic Analysis
The Path Forward
Answers to the most common questions about the current state of through-running.
What Changed Since March
Three developments in April 2026 have sharpened the stakes before the May 4 master developer bid deadline.
OPRA Records Confirm Railroads Already Have the Draft Report
NJ TRANSIT documents released under OPRA on April 23 and April 26 confirm that the railroads have already received the Service Optimization Study Phase 1 draft report. Separately, FRA officials asked NJ TRANSIT to release a Penn Station RTC model developed in coordination with MTA and Amtrak. The public has not seen either document.
RPA Report Concludes Through-Running Would Reduce Capacity
On April 23, the Regional Plan Association published a report concluding that through-running would reduce Penn Station's capacity. The report assumes station dwell times of 7 to 12 minutes — approximately 6 to 12 times longer than achieved performance at international peer through-running stations. A point-by-point technical critique evaluates the report's dwell-time assumptions and methodological gaps against the international record.
Amtrak Sues the MTA Over Acela Track Access
On April 23, Amtrak filed a federal lawsuit against the MTA over testing access to the Harold Interlocking for new Acela trainsets. The dispute exposes how unstable the current multi-agency operating paradigm is — the same agencies that are supposed to coordinate a unified Penn Station rebuild cannot agree on basic track-access rights.
May 4, 2026: Master developer bid deadline. The operating requirements embedded in this RFP will determine whether the selected developer designs around terminal operations or through-running readiness. Once the contract is signed, pivoting becomes a change order.
Put It In the Contract.
Demand the Record.
Through-running only matters if the design contract preserves the operating option. The public record should include the capacity data, dwell-time assumptions, and model files behind the current procurement before a master developer locks Penn Station into another terminal-first plan.