All the details are in the public domain it will just take time for someone to sit down and do the math
All you need is the DTO demand model and some fairly simple maths and one simple equation
Peak Demand = 4 * Off Peak
Based on that you can work out the annual numbers, fares are benchmarked against other transport so they are known, rolling stock costs are available staffing costs are reasonably well know.
If the RPA won't tell us simply ask the crew in Madrid how many staff they need and so on and adjust
What I can say is the business case is shaky as many of the assumptions are suspect but the demand numbers seem solid enough
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