 After leaving the interlocking control of Mission Tower (signal box), the sharp curve of Redondo Junction (which had a speed limit of 15 mph) was normally reached in six minutes; but the RDC's could reach the junction in only two.The tower man (signalman) at the junction saw the cars turn over onto their left sides as they approached the junction and slide with a shower of sparks, and then total darkness.He immediately called the emergency services who were quickly on the scene along with railroad staff from the adjacent Los Angeles Roundhouse.