That’s how every train works since this system was made mandatory in the US in 1893(!). Asymmetric breaking does not cause cars to come off. The joint is strong

That’s how every train works since this system was made mandatory in the US in 1893(!). Asymmetric breaking does not cause cars to come off. The joint is stronger than the breaking force. Anyway, we know it was a portion of the track that had a weld fracture.