The most favored is the NEC proposal to upgrade the rail line that runs through the center of the state, from New Haven to Hartford and then Springfield, Mass. Demographers project that between 2010 and 2040, the population in the Northeast Corridor will grow to 64 million, an increase of roughly 23 percent. Six of Amtrak’s busiest stations are in the Northeast Corridor, with New York and Washington ranked first and second for passenger traffic.