There is no "suitcase" but there is a briefcase, the one in Tesla's cabin that holds his transformer.
There is also a "trunk" with Tesla's name on it in the baggage car, which you can examine after you suspect him.
u put the suitcases from little est to biggest then put the board
you stack them up in order from small to big
you find the key
well, in that case, you have to ask people on the train questions, then you find the machine in a suitcase. thats all i know :-I GOODLUCK :D
In the back of the train
in the luggage room their are black fingerprints on a suitcase click on it.
ask a differrent
you die
You go talk to everyone
you find the coal smudges on one of the luggage cases after the train stops unexpectedly
tell the train driver stop the train until you find her key
you give him prune juice and you find a luggage key.
its behind the birdie poster on him wall.
in his cabin you can find it by running through the train cars and entering the door that says (Thomas Edison)