A "Railfan" is someone who films or photographs trains. This cache is next to active train tracks (with a fence beetween cache and tracks) This cache also likes to railfan! If you are finding this cache and see a train coming, stay and watch it, they are not long and only takes about 5 minutes at most to pass. And take a photo of it for your log! If a signal is red and a train hasn't passed on that track in a while, a train is approaching.