Here is a first look at the option I selected. These are 3 Kato single plate girder bridges [20-452 with Kato piers 23-017].
I had to expand the span to accommodate the 3 bridges and then excavate to allow the piers to be set on the plywood base.
The 2 inch tall piers were shorted by cutting off the bottom.
The holes in the scenery have been filled with lightweight spackling which needs to dry before I paint it and add ground cover
and grasses.
These were gray bridges that I painted with Polly S Steam Power Black.
The bridges are set at a height to allow the Atlas True-Track to be set on top of the Unitrack; the Unitrack joiners were left in place
between the middle and two end bridges to add stability.