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I decided to build this actual, robust, working college calculator to demonstrate the real-life impact on individuals' personal finances, especially the finances of someone supporting children and expecting to see them through a college education.
This calculator is a little different (and, in some ways, better) than most college calculators in that it adjusts savings contributions -- the "monthly outlay" -- to be constant with respect to general inflation. It also allows separate assumptions for the rates of general inflation, tuition inflation, and anticipated return on long-term tax-free investments lodged in a special tax-free school savings account, like a Pennsylvania TAP 529 account, for instance.
Because the 2005 fare hike imposed on commuters was essentially a policy shift as to how much discount commuters can receive on their tickets, it is likely that, should it not be repealed, the price differential between rates determined by the old policy and rates determined by the new policy will also grow with inflation. Thus the monthly outlay lost due to Amtrak's fare increase effectively increases over time.
Assuming that the parent keeps contributing to the account all the way through the college years, the "end of college" funds figure indicates how much money is still left, or, if negative, how much debt is likely owed.
You can change the number of kids, their current ages (all assumed to be the same age), play with inflation and investment assumptions, and test out various colleges (40 listed) based on the most recent current cost figures I could find. You can even specify the size of your current college nest egg as part of the calculations by changing the text box entitled "college funds, right now."
Try out the three different commuting base cities, and the 9/9/05 fare increase by itself, or in combination with the two other fare increases of 2005. You can even check out how not commuting at all would affect college finances.
Once you run the numbers, you'll be able to appreciate why people are jumping off the trains and into cars.