It says that it is legal and has been permitted by the Treasury Department since 1967. As I recall, it is legal to alter money in the U.S. as long as it is not done to defraud (e.g. to cut a penny down to dime-size for use in machines or to change the numbers on a $2 bill to look like a $20 bill). I've seen dozens of machines that will take a penny and squish it out, putting an imprint on it as a souvenir. That is legal also. Putting coins on the railroad track is also legal as long as they don't injure anyone or damage property, including the train by derailing it; however, being on the railroad tracks could be charged as trespassing.
But why would you want to spend it? It's a freakin' collectible! :razz: