I'm also kind of rushing it so we have SOMETHING everyone else can do. There'll be a train robbery, you'll have to fight guards, this'll be your party, you see the robots, and you escape via hot-air ballon after a dramatic confrontation with Sheriff Jack Hansom. Everything else is details.
Some of this is game-y, others is setting the mood. I'm sure we can work gameplay into this pretty easily, at the very least in the form of guards.
Vacca Robota Episode 1, Chapter 1, The Top Rail Train Robbery
Death Valley. High noon. The Metal Chariot, a new and extremely fancy locomotive, races across the desert at a blinding speed. A group of horsemen start riding out ahead of it. They are the Maleficent Seven, the meanest whoresons North of the Rio Grande. They ride alongside the train, and one by one, leap from their horses onto the carriages. They climb to the top of the train while it's still in motion
Reagan Flaherty: All right, boyos. Just like we planned. We'll go ahead and stop the train. The rest o' ya earn your breakfast.
Reagan, Richard, and Robert Flaherty, the gang leaders, run ahead to stop the car, leaving the other four as the the battle party. Thugs O'Malley, the gang's muscle, who once arm-wrestled a bear for ten dollars and a night with it. Doctor Jesse Custard, who patched up the gang in exchange for money to support his morphine habit. Sherry Bourbon, whose skills of seduction were matched only by her knowledge of explosives. Malcom Outlaw, new to the gang, about which the others knew a lot less than they were comfortable with (except Thugs, who enjoyed ignorance). They slide down to the door of the rear car, which Thugs punches open.
Jesse Custard, MD: All right, everyone put your hands up! This is...a....
The car is full of armed sheriffs, on their way to the SherrifCon 1885.
Jesse Custard, MD: ....A test...of what to do if you get robbed. Good job. You all pass. We'll be moseying on off and leaving you on your way.
Sheriff Jack Hansom: It's the Maleficent Seven! Get 'em!
Jesse Custard, MD: ....Bollocks. Scarper!
The four turn tail and run into another car, full of passengers.
Malcolm Outlaw: Help! We're being chased by bandits!
That utterly fails to convince anyone. They run up to the front of the car, but a lawman's is waiting.
Sherry Bourbon: We've been set up, fellas.
Thugs O'Malley: Fight!
Battle. They run into the next car, and lock the door behind them. It's full of crates. On the wall are metal men, full of gears
Jesse: The World Of Tomorrow Exposition goods. This what we came here for.
Malcom: Yes, that's wonderful. Anyone have a plan about how to deal with all the guys who want to arrest us?
Jesse: Feeling pressure? If you want, the adults will handle it. Let's check these crates, and see if any of this junk is useful.
Sherry: Don't mind him, hon. He just likes handling people's junk.
Jesse: Shut up and look around
Everyone does just that
Thugs: What are these suits?
Everyone stares at the metal men
Malcolm: They're....mechanical men....
Thugs: Why would anyone want a steam powered man?
Sherry: I can think of a few reasons...
Jesse: I thought we were trying to escape. Look for USEFUL things, not mannequins.
There's going to be a dramatic boss fight with a sheriff, and they escape with an automatic gyroscopic flight hat, which breaks about ten seconds after they lift off, but gets them off the train safely, into a desert area.
Sorry about the lameness of this. I fully intend to edit this quite a bit to make it less bland, but I think the point is made.