Mad Dog is there, armed with his longsword and armored in a suit of studded leather. He looks up from the map of the brewery as your group comes in and says, "If you are ready, we'll make our way to the rear of the building. I've been thinking about what we could use as a signal, and I think I have an idea. The morning rail from Fairhaven should be arriving in about an hour. When the rails come in, the bells at the station ring holy hell and you can hear 'em all the way down there in the slums. When you hear that ringing, that's the signal. Sound good?"