Mexico City has an extensive train/subway system called the Metro, I’ve ridden it when I was in the city. See my article about it from back in 2013 entitled Moving Millions Through Mexico City’s Metro (how do you like that alliteration?).
In the just-concluded calendar year 2025, three babies were born in the Metro system.
All 3 were born to young mothers. According to Excelsior, one mother was 21 years of age, another was 17 years of age, and one of the mothers was 13 years of age.
None of the three actually gave birth on a moving train car, but in stations of the Metro system.
During the year, assistance was provided to 163 pregnant women in the Metro system.
It’s been reported that babies born on the Metro receive the right to ride free the rest of their lives, but according to a statement by the Metro reported in 2024, that’s not correct.