I have my doubts that was a truck bomb - on some of the other clips there is very little debris even close to the site of the blast, and the damage is very localised:
If I had to guess then its either a really small bomb which set either the fuel truck or (more likely) one of the rail cars into a BLEVE (which then caused another BLEVE as the other object blew up), or its happened as a freak accident. I lean towards the latter, mainly because of the extreme difficulty that someone would have to time that so accurately (as in to time it when the truck passed the train above a weak joint in the roadway) - which also to me makes a missile or drone strike unlikely too. Only God is usually that precise.
I'm wondering whether the damage to the roadway is just a happy "collateral damage" accident, and the main effort was directed at the railway element. Given Russia's parlous truck logistics situation, the railway link was far more important than the road.
And it seems to me that delivering the quantity of explosives necessary to do real harm to the railway bridge would have been a major undertaking, whereas arranging for Russia to "BYOB", and just providing a source of ignition would be a much more logistically straightforward way of going about it. Timing the explosion to catch a fuel wagon might have been tricky, so I imagine that someone (or a drone) would have needed to be in the vicinity to ensure that the button got pressed at the right moment.
But meh, speculation. I don't suppose we'll really know until Ukraine, probably in a couple of months' time, tells us what they actually did. And it's very much in their interests, as it was with that mysterious series of explosions at the Crimean airbase, to leave Russia guessing and paranoid for a good long while.
When I saw the railway bridge burning, though, I was reminded of that freight train that caught fire in the Channel Tunnel - the damage that did to the concrete tunnel lining was extensive, even without explosives, and the whole thing had to be stripped out and rebuilt. I would imagine that, at the very least, that segment of the bridge is going to be "untrustworthy" until some serious work has been done on it. The concrete will be utterly compromised, and I'd have thought that the steelwork is likely not just to have warped in the extreme heat, but be structurally suspect now, too.
Happy belated birthday, Vova! (the best presents are the belated ones...)
