"New York City officials are studying a proposal to extend the No. 7 subway line from Manhattan under the Hudson River to Secaucus after New Jersey Governor Chris Christie killed plans for a new tunnel linking the states
I like this plan and it may be better than the original. First off it's cheaper than ARC and that new tunnel was just for NJT into the West side. With this plan anyone could get on the 7 train in Secaucus (Amtrak, NJT, PATH) and easily get into/out of the city and to either the West or East side of the city. Commuters coming up from NJ/Philly who didn't work sort of close to Penn Station and its accessible subways had a rough go of it to get to other parts of the city; this is largely resolved with the 7. I bet this would cut down on NJT trains that need to come into the city as some may terminate in Secaucus or the extended 7 line would simply reduce demand for NJT thus NJT would run fewer trains. Less traffic in the Hudson tunnel means it'd be better for Amtrak so most likely better for those Philly commuters who take Amtrak. Not sure why they didn't think of this in the first place.