It also doesn't make sense from a design perspective. Trains, cars and truck have very different loadings and operating geometries. The bridges around here end need to have a large vertical clearance, which is hard for the trains to manage resulting in low-level bridges. Meanwhile car traffic prioritizes reliability and services levels, so high-level bridges are used to avoid marine traffic closures.
The train bridges also have to accommodate much higher loads.
Basically it makes it much more expensive to combine freight rail and road traffic than a single bridge would be.
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