@Rick Rubino posted:as most of the train passed over the bridge maybe it was a derailment that took out the bridge rather than the other way around.
Much more logical. I have also read speculation that that empty center-beam car just might have had an overheated roller bearing, which burnt off the axle, setting fire to the bridge beam & ties as it moved along, eventually completely derailing and tearing down that section of the bridge over the land. All speculation of course, but sure sounds logical.
