It appears that a garbage truck broke through the wooden barrier, and a security guard then ignored warning signals and waved drivers across the crossing. Two trains then came barreling through.
Viral news gatherer Hypervocal points out that while “Argentina is notorious for its lax driving regulations, which leads to the deaths of 7,000-8,000 people per year [and] most Argentinians have grown indifferent to traffic accidents... This is no every day accident.”
Watch the raw footage below: