Well, if it was perchloric acid, I could see an evacuation downwind. I have visited the golden spike tower there, it is a neat place to get an elevated view and some museum-type displays (like how they fix 10,000 wheels a month!). I love standing on the balcony and listening to the couplers ricocheting down a long line of freight cars. There is also a park north of the railyard where you can explore a steam Challenger, a diesel locomotive, and baggage and RPO cars.