There are tons of papers and research on this topic. Here's just one review of some of the various approaches that have been used. https://www.researchgate.net

There are tons of papers and research on this topic. Here's just one review of some of the various approaches that have been used. https://www.researchgate.net/publication/341476435_Railway_Transition_Curves_A_Review_of_the_State-of-the-Art_and_Future_Research https://www.researchgate.net/publication/341476435_Railway_T...