I have recently come across my dad's model railroading things. There are parts, 40 years worth of modeling railroading magazines, H scale cars and more. Are these things people would be interested in buying?

Sarah...Just about anything train related will interest somebody. Vintage HO has a pretty good following. Prices will depend on brand name, condition and desirability. The magazines may also be of interest to some folks. Just bear in mind most of your items will be worth what someone is willing to pay and you aren't likely to pay for a college education with the proceeds.