knowledge on Instagram: "The train token exchange system is one of the most precise safety methods ever used in rail history — and this rare miss shows just how little margin for error exists. • What the Token System Is: On single-track railways, a physical token gives a train permission to enter a section of track, preventing head-on collisions. • Timing Is Everything: Trains often exchange tokens at speed, using extended arms to pass the token without stopping. • Human Precision: Both crew mem