traction effort representation curve

i want to get the varied value of traction effort of train according to change of speed and attched the equations

[ahmed fares]

here is my mail for more illustration if needed [e-mail]

[jonas]

There is nothing attached and minimum information provided. It is highly unlikely that someone will bother mailing you for more information.

[ahmed fares]

here is attachement of relation of traction effort i want value of traction effort with changing the value of speed

[Rik]

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Have a read here (or here for more general advice) and here. It will greatly improve your chances of getting an answer.