Here is a comprehensive article
from the UK rail publication, Railway Gazette, outlining the proposed mainline passenger train restoration in Mexico.
It appears that the Aztec Eagle, N Laredo-CDMX is high on the list, as is CDMX-Veracruz. Of interest is that both these lines are over the NdeM, which the entire road is a concession held by CPKC. It appears the passenger train interests are starting with where they can place the most "friendly persuasion" - and that is where a concession is held by a US subsidiary of a Canadian road.
I've "been there done that", albeit fifty years ago. The scenery, especially the line to Ciuadad Veracruz, is "spectacular". But would you catch me down there today? Uh, not exactly.