Trains on the Green Line (as elsewhere) occasionally run express between two stops to help close gaps in service.  They announce this ad nauseam for the benefit of clueless passengers.  “This train will run express to BU Central.  BU Central will be the next stop for this train.  The first stop we’ll make is BU Central.  If you need a stop before BU Central, get off now.  Express to BU Central.”  (Substituting wherever it is, exactly, we’re expressing to.)

Then about half the time someone will ring to request one of the stops in between.  Conductors usually ignore this, though a few have yelled, “I said we’re going express.”

Today, our motorman just quietly deadpanned, “Will the passenger from out of town come to the front, please.”