Here's a terrific post on a week's worth of graphing lessons. The only note I would make here is that the anchor chart has an inappropriate example of a line graph. Line graphs are designed to show change over time, not categorical data. Other than this error, you'll find lots of good stuff here.
Types of graphs will be discussed in our math lesson the first day of the lesson. Stephanie can use this to explain the different types of graphs we will encounter in describing the changes due to the increase in railroads.