Limited Express

I was waiting for a city bus today and when it arrived, it pulled sharply to the curb like a drunken sailor as waiter-bys like me jump from the curb fearing for our dear lives. As people were boarding, I shouted a question to the driver. "Is this express?" He grufflyreplies, "No!" Sadly, I walk away but it occurred me, for clarity, I should have said Is this limited? Why the MTA uses two words for the same concept is beyond me.