You are all getting WAY ahead of yourselves and leaving out relevant details that will help make a plan.
EuroStar wrote:My maps of Penn Station indicate that the Empire Service can access tracks 1 to 8.
Your map is incorrect or you're reading it wrong. You can access 1-9 from the Empire Tunnel. However, let's put two and two together. Let's take this:
Railjunkie wrote: Looks like the Empire tunnel will be closed during this first bit o rehab.
and
EuroStar wrote: The second case can occur only if they work on say Ladder U first while ladder M remains in service and the other way around. Trains will first need to go in and then out single file (as opposed to the simultaneous moves available now). In either case the reduction in capacity seems significant enough that Midtown Direct service is guaranteed to go to Hoboken for the duration of the work. <snip>
There are a bunch for switch frogs and wooden ties on one of the tracks in the west throat of the station (that portion is out of service).
It is not the tunnel itself. It is the removal of the switches on the M and U ladder that will hinder movement to the tunnel. As such, they are doing some work in there at the same time. There are NUMEROUS proposals still being hashed including leaving one through route during the weekdays with pull-pull operation with a weekend diversion.
Expanding on EuroStar's assessment, there is a third premise which keeps sailing over everyone head. They are also working on the X's (leads on the west end of the station.) Certain leads can take you to certain tracks. There is an important junction between the 9th Ave and 10th Ave signal bridges that allows access to the higher tracks and lower tracks from the North River tunnels. As Eurostar mentioned, when work begins on those tracks, not only will you lose access to certain station tracks, you will lose the ability to get from one side of the station to the other. In operational terms, if a train enters from the south tube of the North River tunnels, that train will not be able to leave the station in the north tube. It will HAVE to leave in the south tube. The same goes for the north tube. If a train enters from the north tube, it will only be able to access the north tube. If you fill up the station, you will have to wait for things to clear before you can send in more trains, which will result in single tracking in some cases or flip flopping the current of traffic in the tunnels to loosen up the station.
This is compounded by something no one seems to mention. For the last few weeks, they are taking one of the East River tunnels out of service between 10am and roughly 2pm for midday repairs. This reduces capacity heading east and hinders looping trains. This seriously impacts the Empire trains as they would have to "swing" on the east end of the station to access Line 3 so the train can be looped. This is why some of the midday Albany trains were running pull/pull and this is why it may be easier to just run the service to GCT. With leads out, you can't have a train hogging a track for hours.
All of these constraints are being evaluated and they are far from finished. I'm mystified at the level of speculation. My only guess is because it is Penn Station and it is busy. The reality of the situation, is tracks and routes are closed for track work all of the time. Every year, the Crescent is canceled in the early winter Mon-Thu. The Colonial is canceled Mon-Thu every year when they work on the Peninsula Sub. Hell , I haven't see any reference to the
Coast Starlight being canceled between WA-CA since April 25th because of a derailment that damaged a bridge on this forum. The early estimate for restoration is the middle of May. That's almost a month without service, and no one bats an eye. There are plenty of options for Penn and they are being explored. Building a temporary train station for the Empire train for a temporary outage shouldn't even be considered. Just as the Coast Starlate passengers are adapting, so will the passengers at Penn.