Quick and dirty version----- you send characters to collect recycling material for the tip, when that is full you use that to make plastic, metal and glass in the recycling centres, then finally you e...
Short answer is that they are made at the rail yard. Here's how
Start with recycling trash at the dump. Then you have to use the metal, plastic, and glass recycling buildings to separate the trash. Last you go to the railyard and trade it in for blue prints, which once you get so many it will give you a piece, pieces, stations or whatever prize is up next.
Hope this helps. Feel free to pm any questions and I will do my best to help you.
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