The paired rails are kind of rusty red. Monk wonders where this tunnel leads, and where he and Minx are standing right now. He guesses they’re somewhere on the east side of the Hudson. Maybe Manhattan. Probably north of that. He’s never spent much time in Manhattan so he’s not really sure how far north of the island the subway tunnels go. He knows they go way over into Brooklyn and Queens and some cross into Jersey, but north of Manhattan? He’s clueless.