Forget economic woes and oft-delayed trains. New Yorkers are more concerned about the grossest thing in town. According to amNew York’s Matthew Sweeney, the number of rats in the subway are on the rise. This underground denizens are taking the subsurface tunnels by storm, and officials are blaming both increased construction and increased volumes of litter due to higher ridership figures for the surge in rodent population. From the sound of things, the IND line stations south of 34th St. are among the most rat-prone in the city. Lovely.