>>1314337This line was converted to light rail operation in that year, with light rail trains built on the basis of PCC cars which had been destroyed in the 1985 earthquake. The Tlalpan branch was closed in 1990. The Xochimilco light rail operates to this day.
Pic related is a rare photo of light rail operation on the Tlalpan line, which only lasted for 4 years.
The rails of the short Tlalpan branch and the light rail era boarding platforms are still pretty well preserved. They could probably be reactivated, but the city has no interest in that.
There's also a large amount of remaining visible rails all over the city.