> Railroad companies routinely clear-cut and/or spray with herbicide any vegetation that grows too close to the tracks.<p>Cool example of this: drone footage of the Hiwassee Loop where all the Kudzu has been killed, so you can get a sense of how massive just the vines are. Then imagine them with leaves: <a href="https://youtu.be/5V3oHAtfh3M?t=256" rel="nofollow">https://youtu.be/5V3oHAtfh3M?t=256</a>