A well-known mechanic trick

[rosebaby3892]

What a movie.

Besides, during this huge mess, Jeannine, Wilford's assistant, goes out to see who's making noise, there, oh, where do you think you are, and also gets fooled by Minsoo who visibly, despite dying 5 minutes before, is now in great shape. So, let's go back inside Wilford's to see what's going on, and where our two thieves are still deep in conversation:

"...and that's how I understood that I shouldn't use the RER B rails.
– That's fascinating, Wilford. But in the meantime, what do we do now?
– Well Curtis, you're young, you're strong, you've foiled my plans in part, so what would you say now that the number of human beings on board has been regulated thanks to my cleverly organized revolt to take my place?
– And for example, having a birth rate policy rather than regulating the population with a shotgun? Or not having a prison when there are too many of us?
– No. That would be way too clever. But you could also have an ugly dressing gown and walk around in your underwear all day in your luxury compartment.
– I have another question before: what about the children who disappeared?
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Wilford nods and goes to lift a slab from under the floor: we then see a child making a repetitive gesture within the cogs of a machine located beneath the floor. A gesture that resembles the one Gertrude made at b2b email list the very beginning of the film. Wilford explains: "  The Train Power Machine is eternal... but not its parts! That's why I replace the faulty parts with children. " 

Yes, it's

"Ah, the carburetor blew.
– Put a child in his place!
– Mgnn… reeeeeenter…. gnnn… there, it’s working again!
– A tire burst!
– Have a child!
– Holy shit, the oscilloscope just imploded!
– Give me the little epileptic!”
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Yes, it's well known: children can replace any mechanical or electronic part. I myself recently replaced my PC's motherboard with a chubby child (there's more room for RAM sticks). But is this film a comedy, or what? Wilford also shows the gesture the child must make until exhaustion within the machine: he confirms that it's the one Gertrude was making at the beginning of the film. Gertrude couldn't have known this gesture. So it's simply bad, a failure, and everything you want on every level.

That said, all this annoys our hero a little: he beats up Wilford and does what he's always dreamed of doing, namely, losing an arm to save a child. Indeed, by getting his hand stuck in the cogs under the floor, he gives the child a chance to escape, which he does. From then on, the team thus reconstituted will place the Schnoof, which is therefore flammable, on a blocked door of the train and blows everything up to open a path to the outside. The explosion is so strong that it causes an avalanche (since the train was passing through mountains at that moment, besides the sets are either destroyed cities, or mountains, or giant bridges, this train only knows that and obviously the world is made up of that) which overturns the train and therefore causes its derailment.