The Loose Wire That Destroyed 3 Trains | Clapham Junction 1988

How did a single, loose electrical wire lead to the catastrophic collision of three crowded commuter trains at London's busiest railway junction? On December 12, 1988, a devastating multi-train collision occurred at Clapham Junction in London, claiming 35 lives. The cause of the disaster was tracing back to a shocking source: a "cable chaos." An overworked technician had left a single old wire loose and uninsulated inside a signal relay box. When vibrations caused the wire to short-circuit, a red stop signal falsely turned green, sending a packed commuter train at full speed into the rear of a stationary train. In this episode of Red Signal, we investigate the deadly mechanics of false green signals, the hidden dangers of rushed maintenance, and how the Clapham Junction disaster permanently changed British railway safety.