I'm pretty sure if you read the post it is pretty clear that the railroad's request has nothing to do with national security. The railroad asked her to stop because they didn't want to have to deal with her getting hit by a train.

The way around this is simple; ask the railroad for permission and try to work out some accommodation that allows them to stop worrying about liability. A little bit of social engineering goes a long way.

I wish he had posted the audio, the transcripts read like something David Pogue would write.

http://www.epa.gov/ttn/atw/hlthef/methylet.html

Yeah... I want some of that in my cheese. If you must, use the alcohol based markers with a big #2 on them. The alcohol burns your nose, not your liver (or you unborn child).