Only the Franklin Shuttle has 2-car trains, and it'll soon be switched to 3 cars since they're replacing the 75 ft cars with 60 ft cars.

OK but the article also says:

- There's only one 2-car line, the Franklin Ave. Shuttle

- That line is converting to have 3-car trains.

So to begin with, the set of small enough trains is the tiniest portion of everything the subway does, not even covering all the small "shuttle" lines. And then even that tiny exception is set to end. Big difference between "applies to the busier routes" and "applies to essentially all the routes."

The article counts all the off peak and overnight trains, including shuttles. Even out of all of that, only the Franklin Shuttle is 2 cars and will soon be switching to 3 cars.

For longer trains you could make that case, though it should be the agency that makes that call, not politicians that don't have the information to make technical safety calls. Systems across the world don't seem to have issues here though. In any case, there's no world where one employee is enough for emergencies in two cars, but not enough in three, while two employees are sufficient in a train with ten cars.