I mean, really. How difficult is it to say the names of the interchange lines?
Downtown Crossing intersects the Red, Orange, Green and Silver (Roxbury branch) lines.
Maybe once every ten journeys does the conducter state this. It's always "Change here for the Red line". That's it. Does it take that much more effort to say "Change here for the Red, Green and Silver lines" ?
I wish I was a tourist. That way when I didn't hear my interchange listed, I could go to the conductor window and punch him in the mouth.