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A layout featuring the train tunnel. The middle support posts for the bridge fit into notches in the tunnel. Unfortunately, there are no studs in the notch areas, so the tunnel is not nearly as useful a building element as it could be.

Adding at least one straight track length at either end of the bridge will prevent non-motorized engines from derailing at the first corner. The speed gained from coming down the bridge hill is just enough to cause most non-motorized train engines to derail if there is a curved track immediately after the bridge.

Here's a detail photo of the tunnel and bridge: