I don't think a desire to travel denotes classism, It denotes a desire, in some cases it may only be aspirational. Many different people travel from many walks of life and many because it's their hobby. It depends on where you either choose or can put your efforts and money.
Quick note: If you're in a train yard looking to hop a freight somewhere, instead of risking life and limb, ask the engineer if you can ride in the engine. They might be glad for the company.
You’re right again, but telling people that they have to travel or risk wasting their youth, that’s where the problem lies.