The First Crash-Test Movie

I found the first crash test movie of human kind Unfortunately, it was not conducted by cars; instead it was conducted by two trains. During the California State Fair at Sacramento on 13-20 September, 1913; two locomotives were crashed head-to-head. I could not find any information, why they did something like this. Or what was the point of this action.
Eventually, this footage is officially the first crash test recorded in history. According to footage, two locomotives crashed at the speed 90 mph (145 kph). There are no information about any casualties!