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| − | This page outlines some basic cost calculations I use in my vehicle sets, both pre-calculated spreadsheet numbers, and the code used for variable running costs in the game. When designing a set in a spreadsheet, it's probably best to use standard numbers first, then fudge values for vehicles which you think need to be more or less expensive.
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| − | __TOC__
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| − | =Trains=
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| − | ==Locomotives==
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| − | ===Purchase Cost===
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| − | ====Steam Locomotives====
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| − | '''Weight in Tons * ProdCost'''
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| − | *''ProdCost'' is usually 0.25, but can be fudged between 0.2 and 0.3.
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| − | Example: [[4-6-0 Jubilee]], 126 * 0.25 = 32
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| − | ====Diesel and Electric Locomotives====
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| − | '''Weight in Tons * Prodcost * (Horsepower / BaseHP )'''
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| − | *''ProdCost'' starts at 0.4 for early experimental diesels, 0.3 for 1960s production units, down to 0.22 for 21st century designs. Again, these numbers are fudgable if you think a particular vehicle should be more or less expensive. For electric locomotives, early vehicles are 0.5, and is down to 0.4 by the end of the century.
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| − | *''BaseHP'' is a "typical" power output for engines of that type/era. For diesels, I use 2000 for models designed before 1975, 2500 from 1975 to 1990, and 3000 after 1990. For large electrics, I use 4000.
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| − | Example: [[EE Type 3]], 107 * 0.3 * (1750 / 2000) = 28
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| − | ===Running Cost===
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| − | '''(Horsepower * EffCost) / (SuspCost - MaxSpeed)'''
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| − | *''EffCost'' is the efficency of the design, where a higher number is worse; 5 for most steam locomotives, with a slight bonus (down to 4.5) for later very large locomotives in NARS. 3.75 for most diesels, down to 3.5 for modern designs. 3 for most electrics. Very powerful locomotives may need lower numbers and very underpowered vehicles (eg railbusses) may need higher numbers.
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| − | *''SuspCost'' represents the wear and tear on the traction system and track, and is a number roughly imagined as the speed at which the vehicle will fall apart. I use 200 for steam locomotives and 300 for modern electric locomotives, 225 for first generation diesels and 250 for modern diesels.
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| − | Example: [[4-6-0 Jubilee]], (1550 * 5) / (200 - 90) = 70<br>
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| − | Example: [[EE Type 3]], (1750 * 3.75) / (225 - 80) = 45
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| − | ===Variable Running Cost===
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