Upvote:1
I would suggest it means "West", as well. My assumption is that this is a result of the recently-opened Moynihan concourse geographically "West" of the original Penn Station building. This is a new concourse (as of January 2021) to get down to track level in addition to the original concourse of the original Penn Station structure. I believe the original concourse is still there, but probably not used for much (though I don't know for sure, as I've only been there on a through train and never got off to see the inside of the station itself).
The Moynihan Train Hall was originally the Farley post office, and recently went through a huge (both effort and cost) remodeling effort to create a much less "rat maze" way of dealing with railroad passengers going through the dank bas*m*nt remnants of the original glorious Penn Station.
Here is the Moynihan Train Hall website for further reference: https://www.moynihantrainhall.nyc/