This is a magical heaven, which takes us into the paradise on earth. What does "Heaven" mean in this song?

the?Qinghai-Xizang Railway

Because this is the way to Tibet, people didn't dare to think that it could be reached there before. Because of the route to Tibet, the transportation is convenient and it is convenient to communicate with the outside world. The plane flies fast, and the journey seems to be no longer long. There are two "heavenly roads" leading to the Qinghai-Tibet Plateau, one is an air route and the other is a railway.