Calculating Track Speed

Hello,

Does anyone know the formula how to calculate max speed through curves passenger and freight?

Thank you!

The formula is currently on a Wikipedia page that discusses speeds ...
http://en.wikipedia.org/wiki/Speed_limi ... %28rail%29

The Wikipedia page is a good page to visit if you don't want to pull the information out of the FRA document. The 2.4MB answer from the FRA (for class 1 through 5 rail) ...
http://www.fra.dot.gov/downloads/Safety ... 040107.pdf
The tables on 125 and 126 are the simple answer, but the rest of the 155 page document says a lot about safe railroad design.

Thank you...