For those interested in such things I have had a go at writing a #python module "parenx" ("pare" + "nx") that simplifies linear networks, such as road and rail, using buffering and either image skeletonization or Voronoi polygons to identify a centre-line

As it is on #PyPi so it is available via #pip

It is beta-code and has a number of limitations but hopefully it might be of interest. Noting that two-dimension areal interpolation problem seems well understood

https://github.com/anisotropi4/parenx