Check out the sneaky video editting... notice the vehicles in the background at 1:04 and 6:02

at  1:04 the train finishes traveling from the upper right to the lower left of the screen, 2 seconds before the 1st train from the lower right to the upper left of the screen

and at 6:20, the 2nd train from lower right to upper left passes through the crossing, only 2 seconds before the next goes through the intersection from lower left to upper right

Found on http://trainfanatics.com/incredible-scenario-of-4-trains-near-collision/