All the data gathering and processing tasks for the new map in 1.10 are now done, along with most of the work required to display them. Game size has increased a little, but I think it's worth it given the extra quality and map features. The new map rendering fixes several long standing glitches and bugs, so say goodbye to visible tile seams and spiky road corners. OSM ways are now rendered with correct layering. The new population layer has increased in resolution, almost down to single buildings. There's still some work left to do, specifically to enable OSM style mods, but 1.10 is way past the halfway point at this moment.
https://carloscarrasco.com/nimby-rails-september-2023/
Devblog for September 2023
Source: Steam Community (opens in a new tab)