Link below. Basically, AMLO appears to be following through on the Yucatan passenger rail project. It probably doesn't hurt that most of the states involved went for AMLO by very wide margins (he seems to have run up around 90% of valid votes cast in Tabasco, for example).
https://www.bbc.com/news/world-latin-america-46588042
https://www.bbc.com/news/world-latin-america-46588042