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The maximal energy density that can be achieved in the collisions of theparticle-like wave trains in the $\phi^4$ model has been investigatednumerically for different wave train parameters. From these results theprediction is made on how many kink-antikink pairs can be produced in wavetrain collisions taking into account that in collision of $N$ kinks maximalenergy density is equal to $N^2/2$ for even $N$. Our numerical results are in areasonably good agreement with the predicted maximal number of kink-antikinkpairs formed in wave train collisions.

High energy density spots and production of kink-antikink pairs in particle collisions