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 Subway icon is made in Material Design style
developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 6,200 icons, all in the same style and quality.