Idea of Stop Train Icon
The icon is comprised of a short section of train tracks with a semaphore directing oncoming trains to stop pointing out from the right. There are three planks over which rails are laid and the semaphore is circle-shaped. The icon represents a train being commanded to a stop.
This page shows the different variations of the Stop Train from an Icons8 icon pack. Feel free to resize and recolor the icon, and then download the icon in PNG format for free.