3.) The bridge have X-ray to scan trucks and car on both ends, whether or not they are probably done, or has been done at all are unknown, so I cannot comment on that. However, if this is a truck bomb, and this is more or less maximum damage, then I don't think it is likely this is a truck bomb without the driver knowing because you have to be very lucky to have all the things line up without direct control of the driver. The bomb has to be detonated on the middle stretch of the bridge and has to be next to the railway with a fuel train on top. 10 seconds before or after would have change the damage matrix a lot because you will be detonating the bomb on top of a pillar, most likely weaken the road bridge but not taking it down, and 10 second would mean you will be 800 meters forward or backward from the train, which will not consume the train, I have ZERO doubt this is a coordinated strike, too much co-incident to have it a blind sabotage, a "Hope and Pray" style strike, if this is a truck bomb, the driver HAVE TO BE IN THE KNOW.