The Wolverine line on Amtrak train leaves approximately 5:35pm from Pontiac, 5:48pm from Troy, 5:55pm from Royal Oak, 6:15pm from Detroit, 6:36pm from Dearborn and arrives in Ann Arbor at 7:06pm. I am located just several blocks away from the Ann Arbor train station.
A train then leaves the Ann Arbor train station that night at 10:57pm to head back.
Another Amtrak train is available in the late morning for the Thursday afternoon massage group. A 6:34pm train departs Ann Arbor to bring you back to your location.
The round trip cost is $20, but if you are a Triple A member it is only $18.
You might want to use this train schedule to come to the massage groups that start at 8 pm on Tuesday and Saturday nights. Prior to the massage class you can walk from the Ann Arbor train station to any of the various restaurants in downtown Ann Arbor, and then walk over to the massage class. After the massage class is over you can hang out at the AUT bar, a local gay bar, or coffeeshops in the area until time for you to get back to the train station. Everything will be within walking distance.