The paths of the tracks are clean and straightforward – a welcome break from the complexity of other modules. But the addition of water (perhaps a canvas print, digital photo, or laminate) and a long bridge add a visual focal point. A lighthouse, partially submerged ship, flashing buoy, wharf, cargo crane, and waterfront village could be featured as well. Perhaps even a simulated whirlpool...

The bridge could be a dramatic and custom element. A basic plate/girder construction is strong and simple, but I can imagine a swing bridge here too.

For a truss or Warren bridge, use hardboard faced with a digital print. A series of ‘concrete’ arches or ‘cantilevers’ could be made from dimensional lumber and surfaced too.

There is enough lead-in space to go underwater instead. Create a tunnel opening at each end and leave the side open and kids could shuttle the train under the bay itself.