Background information:
The "Overlaatbrug" is a bridge, mostly over wetlands. This kind of bridges were build over small rivers, marshes and swamps. The biggest bridges were over 880 meters with 53 identical spans. Most bridges of this kind were shorter. Some of those bridges are still to be found in the Dutch landscape. They might be in use as bicycle-bridge.
Architectural details:
The girders of the bridge are made of multiple layers wrought, riveted together. A girder is suitable for a single track, though they are often in duplicate together on a pillar, still a double track route is possible. The girders are characterized by the many triangles, in particular visible on the side. They also have a relatively low height because there is a modest span.