Fairfield, Connecticut police say the box was a school project that a child who attends nearby Tomlinson Middle School inadvertently left on the overpass near the Fairfield station.
NBC 4 New York obtained a picture of the abandoned box (above inset right); it appeared someone had attached clock hands to it and painted some sort of mask with what looked like small black pupils above it. NBC 4 New York Facebook fans pointed out the box looked strangely like Bender from "Futurama."
A bomb squad was called in, and the all clear was given a short time later.
Service was suspended through Fairfield for about two hours while authorities investigated.
Train service between Stamford and Grand Central terminal was not affected.