Idea of Subway Icon
It's an icon for a subway train. It's the front of the subway train where the destination sign is on the top. The middle part of the train has two windows for the conductor to see out of. Below these windows are the headlights for the subway. The subway is aligned on two tracks that are jutting out in front of it.
This page contains the Subway vector icon, as well as variations of this icon in different visual styles, and related icons. All icons are in the flat vector style, however, differ by the line thickness, fill, and corner radius.