You pose as the porter (who conveniently looks just like your avatar).
Once you have talked to Mlle. Moreau in the baggage car, go to the porter's cabin, open his closet and get the spare outfit. Put it on (at least the cap) then go to Nikola Tesla's room. He lets you in, then you pour him three glasses of Prune Juice. When he leaves, you can look around his room for clues. Just before he returns, you will find the luggage key that you need.
Nikola Tesla will give you a gift
Tesla's case should be in the baggage car. It has coal stains on it.
In front of the bed the briefcase was open instead of closed
because he also created an invention. the lady reporter is the ban girl! good luck!
You
As you walk through the train you find a pencil. When the porter throws away the drink order, pick up her order pad and use the pencil to shade the blank page, to reveal any marks made on the next page. The orderer is revealed as Nikola Tesla.
the briefcase was opened
with the key that tesla gives you
Mystery Train Island is an online game from Poptropica. In order to get Tesla out of chains you need to get the lock pick set from Huidini's room. Then you must pick the lock on the chains.
The prune juice is in Tesla's room. Change into the clothes of the porter to get inside Tesla's room.
In order to reveal the notebook passage on Mystery Train Island, find the pencil.
Telsa is hiding a book he's writing.