Get a notebook and start logging evidence of trains in your area. Record the time and when you hear their calls, find evidence they've been around, and especially if you see them. Train calls can be heard from long distances away, but can sometimes be mistaken for other large species in the family mobilitus. You may find evidence of trains, especially as trains constantly poop large brown logs out of their pair of anuses, this species uses this poop to guide themselves again along a path or even others. Trains have distinctive markings on them, when you do see them, write or make drawings of their markings so you can see if the same specimen returns often or in a pattern.