What is the point of using classes if you are just going to lump everything into one?
Classes should contain functions that are all grouped together by functionality.
Instead of having a "transportation" class, break it up into "car" class and "truck" class and "train" class. Car and Truck have similarities, but Train might need the method "blow_whistle." I don't know about your car, but mine doesn't have a whistle, so it wouldn't make sense to have Car and Train lumped into the same class.
Does that make sense?