BOFC: Bridge on flat car. In this case three flat cars, with the center car as an idler. Bolsters on end cars all couplers are blocked. Car numbers: ARR 12936, ARR 12948, ARR 12939.
Harbor Island is where ARR traffic accumulates, prior to connecting with the next northbound barge. Spotted in the mid afternoon of September 24, 2022.

This is the future Bird Creek bridge.