![Wooden ramp to load trailers and vehicles onto railroad flatcars](https://www.trains.com/wp-content/uploads/2021/05/20210520.jpg)
Intermodal engineering
Wood planks were common for building piggyback ramps. Large planks formed rub rails (well-used judging by the scars) along the edges, with a notch for the flatcar coupler and a steel bridge plate on the right. Classic Trains magazine collection
CNW 3rd Ward, Milwaukee, WI