Not sure about the downvotes—I understand the allure. However, the reason for it is about liability and danger. It's surprisingly easy for a train to sneak up on you when you're on the tracks (not kidding—I've been air horn blasted off the tracks by a train that I didn't hear coming). The railroads hate cleaning the mess, dealing with the therapy for the engineer, and fighting lawsuits in court as the result of person vs. train. The train usually wins in a spectacular way.