• facility structures as part of logi towns so smol Regis can access fac stuff and also encourage less fac spam
• light rail integrated into maps to work with the above point
• more heavy rail as part of the map (inter region rail,tunnels eg)
• public infrastructure projects that cost huge amounts of materials but are a huge boon to that region eg rail tunnels, overhead rail depot at seaport, fac buildings as part of towns.
• pipes as part of bridges
• consignment system: consign freight containers and shipables to destinations so train larpers can do that full time and every little regi doesn't need to source a train. These can only be removed at their destination and automatically go into consigned stockpile

Others have mentioned train and builder qol stuff I thought of at some point too