I can understand why Spider-Man would be taking the subway, because he's poor, but he can swing around the city, maybe it's too cold outside. But why does Iron Man need to take the subway, he's rich. Also he can fly and is way faster than Spider-Man or the subway. And the other three are all scientists so they should be able to afford a better mode of transportation, or even build their own flying cards.
I don't think these are the real superheroes.