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Drag Coefficient ?

I'm using FCalc for calculating accurate friction values for locomotives and coaches. I have two doubts :-

1. What will be the Drag Coefficient for locomotives ? 0.65 or 1.00 ? Is there any way to calculate the drag coefficient itself ?

2. The friction value is calculated at what speed(s) exactly ? 0 or 100 ?

Please suggest

PC Specs :- Intel Core2Duo E4700@2.6 GHz, Nvidia Geforce GT 710 1GB, Samsung 4GB DDR2 RAM, Seagate 500GB HDD..

Rail Fan & MSTS Fan.