This is a great discussion because... Märklin C-track is sectional too, but has rather tight tolerances for assembly. There is no flex C-track. A computational

This is a great discussion because... Märklin C-track is sectional too, but has rather tight tolerances for assembly. There is no flex C-track. A computational method for solving parts lists and connection plans would be fantastic. Currently people do it "by hand (virtually)" with a variety of apps, but that is labor-intensive. Where is the combinatorial algebra?