You didn't have to experience it, but working the Acelas are horrible. Our Boston based ones are seventeen hour days including the report time and roughly two hour layover, so it may be more noticeable for us. But when I first started, after a trip, I'd be laying in bed and swear the bed was swaying.It probably has a lot of names. We always called it "train feet". It'll go away after a while. Various duration for different people. When it's your job, it eventually goes away or becomes unnoticeable. When I had been working for Amtrak over 15 years, I took several months off for neck surgery and a hip replacement. After my first trip following the extended leave, I had train feet for the first time in years. But I never had the condition again.
Sea legs, dock rock, or stillness illness
After being on a small boat for a few hours and then going back onto land, it may feel like there is still rising and falling, as if one is still on the boat. It can also occur on other situations, such as after a long train journey. It is not clear whether sea legs is a form of aftereffect to the predominant frequency of the stimulation (e.g., the waves or the rocking of the train), whether it is a form of learning to adjust one's gait and posture, or whether it is a form of the Tetris effect.