Guru Padmasambhava's Prophecies
I haven't found the exact source of this, but there are several references to it. If anyone knows the source text, please comment.
Prophecies made more than 1,250 years ago by Guru Padmasambhava also known as Guru Rinpoche. When one of his disciples asked him when is the beginning of the Dharma-ending age. To this he visualized and then replied;
When the Iron Birds are flying in the sky and the Iron Horses are running on the roads, we know that dharma-ending age has arrived. At this time, Tibetan Buddhism shall flourish globally. When the iron bird flies and the horses run on wheels, the Tibetan people will be scattered like ants across the world, and the Dharma will come to the land of the red men (Western Countries).
And...
Guru Rinpoche further prophesied that in that era, carriages do not require horses to move, they self-propel. Youngsters in that era step on something that shaped like a bullhorn and there are wheels underneath that allow them to skate everywhere. It is even stranger that people in that era do not need to leave their houses to know things that happen around the world, just by sitting in front of a mirror.
https://htnsl.wordpress.com/2017/11/01/guru-padmasambhavas-phrophecies/