The minute someone insists there must be through running you know they are disconnected from the realities of the NYC Metropolitan Area. Aside from the labor, power system, and signal system issues, until the world changes, only a very small number of folks want to go to NJ in the morning from points East and to Long Island from West of Manhattan. Running expensive empty trains to solve a problem that has better solutions available is laughable. Gee, can't imagine why so few people with any sense take this guy seriously. The vast majority of people traversing the complex are commuters not LD travelers, they want to get in and get out. Make it suitable for that, not for images on postcards to sell to tourists.
I was in yet another "discussion" with a bunch of foamers on thru-running on a NYC Reddit group this morning.
They can't grasp it is physically impossible, no concept of throughput analysis on trunk lines, universal inter-operable equipment that does not exist, junk all existing rolling stock, just the excuse "eveybody else in the world does it" - NO they don't. They forgot Grand Central Madison exists and that anything with a pantograph can't go there. Forgot that Gateway is not an MTA project, so why should LIRR be replacing their fleet of 1,000 MU cars and spend billions while they do not have a capacity problem to start with.
If they can get through the East River tunnels to Sunnyside, then they can go to LI just as easily - NO THEY CAN'T. There is this little thing called Harold Interlocking, the most complex, congested switching complex in North America leading onto LIRR's 3+1 peak direction operation. They didn't understand that either. Crayonistas only see Penn Station, nothing more. They view Penn Station as BMT Dekalb Avenue.
Another clown said the objection to Manhattan Congestion Pricing is that someone can't drive from NJ to LI to visit grandma. Uhm, those people drive across Staten Island and the Bronx, not Manhattan below 60th Street. You can also walk from track 4 to track 18 in 2 minutes.
So it is foamers looking for excuses to run equipment all over the place and horrified that Penn Station South will cost $12 Billion. No price tag on their goofy schemes though.