All good points. I think I've made the point before, but rail would be useful more for Cross-Westchester than for GCT/NYC bound, maybe even through to Stamford, along the platinum mile.
As Dutch notes, simply no capacity into GCT. Backshop notes expensive connections to Hudson and Harlem (at White Plains) lines are expensive and have same issue, although even as expensive as Hudson would be, a connection to Hudson could possibly use the Empire Connection, although that's nowhere NEAR on the horizon while they still sort out ESA, and later PSA fr om the NH.
The one thing you said reminds me of something I think I posted WAY up thread, even before I started as admin; the possibility of the old Put corridor. I don't remember if I suggested the actual Put, or using the Thruway corridor/median, which solves all of the issues with the old ROW being a trail, grade crossings, narrow, etc. etc.
An 87/287 routing just seems natural to me, although there are certainly topographical/geological issues with grades, tunneling required, and so on. And I think the TZB was built with the capacity to add rail or BRT at a later date.
Honestly, and I hate to say it, true BRT is probably the way to go, or LRT. The rest is a fantasy; There are many more priorities with what to do with the congestion pricing spending. Gateway, 2nd Avenue, you name it. It's a fun fantasy, though.
Next stop, Willoughby
~el Jefe ("Jeff Smith Rules") :: RAILROAD.NET Site Administrator/Co-Owner