I ran the whole route. I understand that it's currently a BETA, so I would just like to make a few suggestions:
There should some scenery around the Williamsburg Bridge. It looks very bare without anything around.
The Williamsburg Bridge could definitely use some more work. Hopefully in a later version it will look as good as the current Manhattan Bridge in development
The .brightness values are slightly off between the Bridge and Essex. It gets dark too late after leaving the bridge and brightens too late at Essex
The curve about 25-50 meters after Flushing Avenue should be fixed. It looks a little bit off
Add in photorealistic textures at Essex
Very minor: get the new Marcy Av announcement (the one that includes an announcement for the B44 SBS transfer)
And just a small question: The V line was finished several years ago, now with the J/Z almost done, how is the current M coming along? The only parts that need to be built now are the Myrtle Avenue Branch and the Chrystie Cut