Like i said,
for her is always the same line,
the same 1.50 pesos,
it even feels like the same ticket...
 
The México City subway is one of the most efficient and cheapest in the world. It provides daily transportation to more than 4.7 millions of passengers, almost the 5th part of the city metropolitan population. There are almost 180 stations. The price of the ticket is only 16 cents of american dollars (it is subsidised by the government in more than 50% of its cost).