I'm confused on buying the engines. I have3 engines (trains with 10 long cars); 2 on Farm 14 and 1 on Farm 22. I was going to put the enhanced (14) where the standard is (22). I am thinking of buying the turbo to replace the enhanced. Do I have to buy the ultimate first? Do I need to do this speed thing for each train? In other words, can I put an ultimate and turbo on 14 since I now have the enhanced and supreme there. Thank you.
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