“… How did the Ukrainians manage to take out the Kerch Bridge railway and roadway at the same time? I have seen no theories on this. But I have seen many theories how just the roadway was destroyed. Well, there is single lane traffic on it now. No heavy trucks allowed….”
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The blast effect from a large explosion can damage (and set fire to) rail tanker cars. With a near certainty sending the truck bomb onto the bridge was timed for when there was a fuel train on the bridge. The drive of the truck was an unknowing stooge so the blast was likely remotely triggered by someone in visible sight (or via GPS tracking) of the truck’s location relative to the train.
Of course the bombers may have simply gotten lucky with the train’s presence.
“With a near certainty sending the truck bomb onto the bridge was timed for when there was a fuel train on the bridge.”
I only read this once. That the fuel laden train was stationary, not moving.