Because of the bottle neck at the damaged part. Only 1 lane is operational at once, meaning the bridge is limited to 25% capacity.(Including speed reduction and only one way traffic at the time, limiting it even further) Limited only for small civillian cars.(max 3.5 tonns).
I see multiple problems with the railroad.
There was oil burning which indicates some thermal impact on the pieces of that structure. Some part of it already melted, some part of it already bend in some extent or beyond repair. But, it seems sure that the carts cannot be moved, possible the gears are not able to roll, or additionally there is danger of skidding.
It is highly possible they have lift the carts off the rails. The method is determined how heavy they are. You can lift them off by helicopter or a crane, but the crane has to be shipped there.
Third option is just push the carts off the rail into the water. It contains not only environmental issues (fuck you orcs if you do it!), but also that the falling carts might damage the columns of the bridge.
I believe they will be occupied by this problem for a few days, maybe weeks.
They had a train come through on the other track, but supposedly it only had 15 wagons, not even fully loaded and had to crawl through at 5-10 km/h. No trucks, no heavy trains so far. Apparently, you need a big ass crane to get those traincarts away, and those are heavy... This will hurt for a good while.
When you realize Ukrainians waited for that bomb on wheels to nicely make it to the bridge before striking it.
But also when you realize Putin was hoping to wage war in Ukraine with Trump heading NATO.
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