It is on the dresser by his door.
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In the luggage car, Mlle. Moreau suggests posing as the Porter to get to Tesla. Go to the Porter Closet and get the extra hat and coat that is there (you just need to wear the cap). Go right to Tesla's room. He will let you in and ask you to pour him some more Prune Juice from the pitcher on his dresser.
In front of Edison's cabin.
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The NY Times reporter says he saw Mark Twain hiding something. When you confront Twain, he denies hiding anything, but you locate his hidden compartment. As yyou leave his cabin, the train makes an unscheduled stop, and the coal man goes missing. The NY reporter now says he remembers hearing someone running past Edison's cabin. The coal man claims he was in the engine room. You find prune juice spilled on the carpet that was not there before.
If you have already gotten the porer's notebook filled with the orders and you know that Tesla wants prune juice, then you go to the luggage car and there will be a French reporter there. She will suggest dressing like the porter to get into Tesla's room by going to the door marked "porter's closet" You will find another outfit on the wall click on it and it will go into your items. Finally, go to Tesla's room and he will let you in. Click on the juice on his dresser and you will be there giving him a refill.
Once you have talked to Mlle. Moreau, go to the porter's 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.
The prune juice is in Tesla's room. Change into the clothes of the porter to get inside Tesla's room.
you give him prune juice and you find a luggage key.
Tesla will have a cup already with him. All you do is click on the pitcher on the dresser, then on the cup to refill it..
It is in front of thomas edisons door on the floor
It is just outside Edison's cabin. You discover it after talking to Mark Twain, as the train makes a sudden unscheduled stop.
Although the porter throws away the order list, the writing has made an impression in the pad. Pick it up and use your pencil to shade the empty page, and you will find that Tesla ordered the prune juice.
You pose as the porter to enter his cabin. Tesla will have a cup already with him. All you do is click on the pitcher on the dresser, then on the cup to refill it.
Because the porter won't tell you who ordered it, and throws away the order slip, use the pencil to shade her order pad, and you can see what she wrote. Nicola Tesla was the one who ordered prune juice.
When you get back on the train after the unscheduled stop, go to Edison's cabin. A magnifying glass will appear near your character and the stains will become part of your evidence.
Go outside Edison's cabin and click the prune juice.Then go talk to the porter.After the porter throws the paper away, use the pencil to rub over it and find who had the prune juice.
In order to reveal the notebook passage on Mystery Train Island, find the pencil.
Head for the luggage car to examine Tesla's luggage. In the luggage car, you find coal stains on Tesla's luggage, and someone throws a pair of scissors at you!