A modular system of bridge/viaduct columns. Any height and width between columns, just tell me what dimensions you want. Multiple heights lock together for alignement. Price approx $10 per 2 columns and 1 cross brace. Varies really depending on size.
A Marklin bridge shown for size. Looking at a deck system to go with them as well, possibly with the ability to slide loose rail into chairs, as per full size practice along baulk rails. Work in progress that but the column system is ready now.