It appears you are an ADULT.
Is it doable ? Of course it is.
Will you be tired by the time you get home. PROBABLY.
You day begins when you wake up not get on the train.
Your business day ends about 5:00 PM when you start your return.
A rather normal business day.
Your travel day has about 5 more hours. Hint your bed not the Boston Train station.
As you are driving the train you must remain alert at all times.............................. Sorry I forgot you are a passenger and can gosh darn it close your eyes and have a nap , relax have a meal , read a book, watch the world pass by the window review your emails and reports on the way home. Maybe call your special someone talk to the children have some great discussion about something with a fellow passenger, watch a movie , the game or whatever on your gadget.
The train you say gets you home about Bedtime. Suggest you just go to bed and SLEEP. You unpack TOMORROW. You will not be your best in the morning . SO WHAT. Avoid if possible a heavy work load first thing. You should be back to your normal self by lunch .
You make one long day seem like months on the road never sleeping , never sitting down always on the move no time to eat or collect your thoughts....
If you must pack your teddy bear so you have your sleep buddy with you for the ride home.
Would this be something you would do many times a weeks? Not really a very good idea unless you like sleeping on trains.
Allowing for NYC traffic you have about 4-5 hours for your business. Unless of course all your business is conducted in the Train Station.
Plan your day not much time for a social lunch or casual chat You can use the time going to NYC to confirm appointments addresses etc.Going home you can do whatever work you NEED to do from your day or RELAX and just go home.