The whole world pipeline (sketch, coarse, two latent passes, decoder, Laplacian decode), then climate, rivers, lakes, 220 generations of settlement history and land cover, running in this tab through ONNX Runtime Web. Nothing is sent to a server; the models (94 MB) are fetched once and cached in the browser.
Layer 4 of the structure pipeline (structures/network.py, router.py, rail.py). The router is a parity port of the Python one (cell for cell at 30 m); what is not ported is the graded deck and its checks, which in Python can send a link to a stiffer search or a lower class, and the final spline smoothing. Links are clipped to the generated world, so a route that would leave it is planned inside it.
Layer 0 of the structure pipeline (structures/history.py), on a 480 m grid. Towns are founded on a world-anchored 4 km lattice where suitability is high; which of them become cities is the simulation's output. Access is normalised by this window's own peak, so a different region size settles the same ground differently.