New York Mayor Michael Bloomberg confirmed this week that the city is studying whether to extend the subway's No. 7 line to Secaucus, N.J. It would travel through a tunnel under the Hudson River.
It would be the subway's only stop outside New York City limits.
Some New Yorkers are calling the idea a waste of money. Transit advocates say the city first needs to fund other big-money transit projects, like a subway line being built on Manhattan's East Side.
Bloomberg says extending the No. 7 train could replace another trans-Hudson tunnel project that fizzled last month.