? for Railfans

[2-8-2]

I really enjoy railfanning...but it always happens by accident. I just happen to be in the right place at the right time, with camera in hand. What I'd really like to do, is be able to KNOW when I can snap photos of passing trains, instead of stumbling into it. How do you guys become Johnny on the Spot?

Are you listening to local dispatcher's radio channels?

Do you just know the schedule? If so, where might I find such info.

Any tips are appreciated!