No, i'll do the calculations right now but it's probably no.
Ok
assuming the subway stations are....30 meters down. NYC subways are from 10-50 meters down and Boston is shallower than NYC but i'll overestimate just to be sure.
Most of that 30 meters is earth, i think the subway walls were something like 6 or 18" of concrete? And the ground above was probably just asphalt or concrete road.
So in total the nuclear blast would have to penetrate 30 meters of earth and, to overestimate several times, 50 centimeters of concrete.
Now the nuclear bomb doesn't have to vaporise a crater 30 meters deep, it must merely manage to crack and destroy the concrete at that depth.
Now the "Sedan" nuclear test was a 100,000 ton nuclear blast done in the desert underground. By comparison, the Tsar Bomb was over 50 megatons, 50,000,000 tons, or 500 times more powerful. The "Sedan" bomb carved a crater 100 meters deep and 400 meters in diameter
We must take into consideration the fact that the nuke was exploded underground, but so can bunker busters.
If you want to say there is an airblast, the Tsar Bomba crater was 100 meters deep. To reach 30 meters, the bomb must be about 1/27th as powerful, or about 2 megatons, by comparison, the size of nukes that were to be used in the Cold War averaged 5 megatons easily.
So it's safe to say the Boston is going to be completely destroyed