I understand from your question you struggle to comprehend that this is possible. I assure you it really is. People who have money take the train. People who own cars take the train. The modal split for Vienna generally is about 25% by car. I would guess more than 50% for public transport for journeys to nearby nature. The trains in Austria are excellent: safe, clean and very punctual. If you get in a train to nature you will be surrounded by people with overpriced hiking gear.