I recall around a week ago I checked the total length of railways in Mexico and it was 23 404 km. Now it is 23 190 km. What happened to the difference of roughly 200 km of tracks in this intervening time? I glanced at the history and did not find any suspicious change. I also took a look at the map in OSM and OpenRailwayMap looking for obvious mass deletions and I found none. It is not feasible for me to check every changeset during this time. I have edited the railways, but that involves adding or modifying, not deleting tracks.
Length of tracks in Mexico was computed using this query with Overpass Turbo:
[out:csv(number,length)];
{{geocodeArea:"MĂ©xico"}}->.mx;
way(area.mx)["railway"="rail"];
make stat number=count(ways),length=sum(length());
out;