For traveling between Jakarta, Bandung, Yogyakarta, and Surabaya, Indonesia's train network is indeed a fantastic option, offering scenic views, a comfortable experience, and a more local feel compared to flying.

If time is a factor, short flights are available between all four cities. But for this route, the train provides a nice balance of comfort, cost, and a chance to see more of Indonesia.

Recommendation: Going by train would be a wonderful way to enjoy the scenery and avoid the hassle of airports.