Every embeddable railcam from every Railfans Live region. The rotator opens on the most recently active cam and switches every 5 minutes; pause or jump if you want to stay on one.
Catch one on the cam?
Tap the button when a train enters the frame. Your report needs one other viewer to corroborate within 5 minutes before it lands on the public map — upvotes earn the reporter reputation, false reports cost it back.