Chuckster2.0,
Listen to these folks. Terrorism, theft, trespass, vandalism, it all depends on what the RR wants the local prosecutor to charge. Technically it's the prosecutor's call but in these cases they listen to the property owners. Even if the spike fell out it still belongs to the RR. Whatever is charged, as micky mouse as you think it may be, even if you win the trial it will really screw up your whole week.
Don't take the chance. Call the RR first and ask permission. If you get it get it in writing. Good luck.
Bill