However Alan... your facts don't match up.. if you just need "one normal exit per car" then the viewliner end would not matter since the Amfleet lounge on the opposite side of the diner would have a vestibule. Unless there is some strange stipulation since Heritage cars have no normal exit they must be coupled to vestibules on both sides?
I'm not sure just how the regulation is worded, but essentially yes, you must have a vestibule on each side of the dining car. Or another way to think about it is to say that one should never have to walk further than one car length in either direction to find an exit.
That makes sense... I wonder if it also has to do with the unique configurations of the interior of sleepers.. for example, are there any emergency exits from within the open area of the cars... i.e. not within private compartments that may be blocked/locked for various reasons? Interesting none the less.
I know I am in the minority here... but I actually like hearing the horn in the middle of the night... it's relaxing to me. Of course... if the car was literally right behind the engine it would be too loud, but when there is a trailing engine, baggage car, and 1-2 sleepers in between it seems like the sound is just about right.