A Thought Experiment on Theory of Relativity

As an extention to Einstein's Thought experiment of Trains moving at speed of light, Let's say there are two trains moving toward each other at the speed of light, and there is an observer present outside of the trains. My question is : What will happen when the trains will collide with each other? What will people inside those trains experience? What will the observer witness?

submitted by /u/ravin-research
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