@bovine3dom@masto.ai the GB gauging is buried in a bunch of PDF files in the National Electronic Sectional Appendix (NESA). I scraped these here https://github.com/anisotropi4/nesa Noting this isn't mapped to a geography but could then mapped using the track and waymarks from the track model https://raildata.org.uk/dataProduct/P-9b4e960e-8bb6-438b-9722-34ae5768a48f/overview