- #1

Tim Leijten

- 28

- 1

So I asked a question here how I would calculate the air drag and the wheel drag of a train and I got an answer that made me very happy.

Unfortunately i don't know where i could find the coefficient values required for the formulas.

So i am wondering if someone knows where i can find these values for trains or how I can calucate them myself.

This are the formulas:

Fd = Cd 1/2 p v2 A

and: F = Crr N

So I need to know how i get the Cd and Crr values.(original formulas in the link in the first sentence)Thanks!