Since we're offering rough track stories, I thought that much of the trip from SAC to SEA was rough, but it could be because the engineer had the throttle set on "Ridiculous Speed" most of the time. And I was in roomette 9 right above the trucks, which I'm certain had a flat wheel. The banging of the flat wheel on the straight sections lessened as we were careening around the sharp corners, probably since that wheel was no longer in contact with the tracks! Of course there was some sort of high-pitched squeal in the corners, so there was really no quiet time.
But what kept me awake was this awful tapping noise from the hallway-side of my bunk, which I learned in the morning was those damn plastic hangers slapping against the inside wall of the "closet". At least I will know what to look for next time.