The Charlotte lite rail system has a public service message which caught my eye. The message is “Tracks are not for photos!”. Note that I am not encouraging the behavior by also sharing the sign which encourages “Live on the Edge”.
In addition to sharing the public service message I am sharing a second photo which shows the popular Rail Trail which is next to the lite rail tracks. My wife and I, along which many others, enjoy walking the Rail Trail.
Following is a link to the Rail Trail website.
Charlotte Daily Photo 
A suitable warning.