It happened at the rail yard at Mykawa Road at Almeda Genoa.
VIDEO: ABC13 coverage of the fire and explosion
A Missouri Pacific Railroad train was entering the yard when it derailed on a track that was being repaired. A tank car containing vinyl chloride exploded. As firefighters were battling the blaze and news photographers were shooting film of the event, a second car, containing butadiene exploded. One firefighter who was perched atop a ladder was engulfed in flames but survived. Another firefighter, Truxton Hathaway, had come to the scene to record the incident for training and was killed in the explosion.
A significant problem in battling the fire was the lack of information that the fire department had. Hazardous materials in tanks cars were not marked. It wasn't long after the Mykawa Road fire that the Houston Fire Department started the hazardous materials (Hazmat) unit.
Special thanks to Scott Mellott of HoustonFireMemorial.org