$1.$ Keeping everything else the same as the Example on page $6$ in Lecture $4,$ what will Fmax be$,$

and what percentage of the wheel load will it be$,$ under the following scenarios: a$.$ If the support modulus increases to $6,000$ lb$/$in$2?$

b$.$ Or if the support modulus decreases to $1,000$ lb$/$in$2?$

c$.$ Or the larger $132$ RE rail section is used?

d$.$ Or if the tie spacing is increased to $24$ in$?$

e$.$ Or if the wheel load is increased to $35,750$ lb$?$Example