With platform project pending for months, at least Greenland's had a project manager in place since June 2021. New photo shows scope of unbuilt railyard.

How serious is Greenland USA about building the platform over the Vanderbilt Yard, crucial to six future towers and the majority of the open space? Well, they sure sounded serious, as of May, with a contractor chosen, and a plan to move forward, pending permits.

550 Vanderbilt and 535 Carlton flank the topped-out, but not yet open 595 Dean two-tower project.
Beyond is the Newswalk condo, 662 Pacific behind it, and the larger 18 Sixth flanking the arena.
Six more towers require a two-block platform over the railyard. Photo: Norman Oder, 11/25/22

But nothing's happened, which raises the question: is this not merely bureaucratic but an unwillingness by the developer to proceed at a time when interest rates are rising, the 421-a tax break has expired (and hasn't yet been renewed), and Shanghai-based parent Greenland Holding Group has seen its stock price decline and its credit rating plunge?

Greenland USA--which owns nearly all of Greenland Forest City Partners--should come clean.

A manager in place

According to LinkedIn, they have a guy in place, Senior Project Manager Sukanta Bhowmik, whose job description, since June 2021--nearly a year and a half ago!--seems pretty extensive:

Working as a Senior Project Manager involves the LIRR Platform Overbuilt [sic] Project, which is constructing a platform over the LIRR Vanderbilt yard, that will support six multi-use buildings and public open space connecting to the adjacent streets. The Platform phase includes the construction of structural columns, enclosed yard infrastructure, girders, planks, pre-cast on metal deck & cast in situ slabs, topping slab, waterproofing, drain, various utilities, and landscaping.

The timing of that position raises the question of whether, upon the company's 9/30/19 claim to the New York Post that Pacific Park was on the "fast track," with the platform set to start in 2020, Greenland had someone else in place, or was just spitballing.

Previous work, railyard figures

According to Bhowmik's profile, he previously worked on Atlantic Yards in two jobs for construction firm McKissack, with his last position, over nearly seven years, as Senior Project Manager:

Senior Project Manager for Stages 3&4 valued at $350 million. The scope of work includes building footings and foundations, AC &DC substation, employee facility, retaining walls, drainage systems, duct banks, the West Portal tunnel extension, temporary bridge decking, utility support bridges, yard piping, drilling S.O.E. Pile, soil anchors, tie-downs, excavation and trucking off-site, and maintaining MPT on Atlantic Avenue. Responsibilities include supervising the field construction of the project, including its organization, planning, scheduling, and enforcing safety, to complete the work on time, within the budget and to the quality specified; developing within the project documents, the quality control procedures, and requirements; plans and reviews the construction program with the project executive, including procedures, plan layout, equipment, and workforce; prepare the project schedule, to keep them properly updated, setting up all project requirements for temporary construction services; and review all drawings and specifications for suspected design deficiencies, impractical details, and constructability issues. Coordinates direct and monitors the daily activities of contractor and subcontractors, labor, and material; coordinates and direct when necessary, the activities of inspection agencies and to effect remedial actions indicated by the reports of these agencies; communicatees with clients, LIRR, design professionals, and other project stakeholders regarding project details and specifications; monitor details scopes of work and bid packages for all the trades and subcontractors; and maintain minimal disruption to occupied areas during construction.
Various office activities, i.e., attend coordination meetings, progress meetings, review monthly cost & schedules, pencil requisitions, prepare executive reports, track project progress, prepare closeout documents.

Note that the $350 million value is a new figure to me, but may well incorporate both the cost of the railyard work as well as the additional scope, which includes building footings and foundations for the future platform. 

Another Greenland executive, as of 2019, estimated the cost of the railyard work, as well as the platform, as each worth more than $200 million.

Before then, Bhowmik spent two years as Project Manager/Superintendent for an earlier phase of railyard work:

As Civil Superintendent, provided quality control and monitoring for Stage 2, valued at $50 million, which consisted of the redevelopment of Atlantic Yards and Carlton Avenue Bridge construction projects, The scope of the projects included a new track, switches, traction power, and substation, upgraded signal system, toilet servicing and structures, the demolition and replacement of the Carlton Avenue Bridge, replacement of perimeter retaining walls, installation of foundations to support a future overbuild, site and street utility relocations, and a cut and cover tunnel under Atlantic Avenue. The work was phased to allow continued LIRR operations in the yard. ( Value : US& 80 Mil)

I think the phrase "the redevelopment of Atlantic Yards" more precisely refers to the redevelopment of the MTA's Vanderbilt Yard. Also note that the numbers seem inconsistent: $50 million or $80 million?