Whether to buy a round-trip ticket for the small train depends on your travel plans and needs. If you need to travel to and from the same location, purchasing a round-trip ticket saves you from having to purchase tickets again. As for going back, generally speaking, buying a return ticket means you’ll be following a set route and therefore taking the same route. If you want to change your itinerary or don’t want to turn back, you can choose a one-way ticket or be flexible to adjust your itinerary as needed.