It's unfortunate that this bad experience is what brings me to the forums, but alas, here goes...! Earlier this fall we made our 3rd cross-country Amtrak trip, from NYP to CHI & from CHI to LAX. The 1st leg of the trip to CHI was splendid; but on the 2nd leg to LAX, it wasn't long till we caught a whiff of what smelled like aerated toilet water in our bedroom -- a reek that could be described as pure sulfurous putrefaction. AND it came like clockwork every number of minutes. So we pull aside our attendant, and he tells us he doesn't smell anything. A while later we ask again, after some older folks have been going up & down the hallway also complaining, and the explanation he gives is that it's the sewage system airing to the outside on a timed basis. All in all, we ate & slept (unsuccessfully) under this stench the whole trip. It was everywhere, even in the viewing car, but less noticeable in coach. My father, Amtrak naysayer #1, agreed to make the trip for the 1st time, and it offered him vindication. He was damning me all the way home! For the asking prices, Amtrak has got to figure something out. My past 2 trips were fine, so I doubt suddenly the toilets are venting outside. Too bad I didn't have a chance to call Amtrak and complain at the time.