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Its imperative to have a constant and high supply of smiles if you want to survive.
This can be done by collecting cards which double as train carriages.
Easier said than done.
These sorts of issues will only infuriate your passengers.
Then there was the toxic wastelands, which will take a good chunk of happiness off your reserves.
But this brutality didnt dissuade me from diving right back in after I was thrown out into the snow.