3 trains. One on the course, one unloading, on loading. As for X being short, it isn't. Its 3,600 feet. Thats quite long for a prototype coaster.
That's the problem with today's steal coasters, they're all short. The parks want to save money and put the rides in small spaces.
I dont think its that. There was a period where coasters were getting very long (hypercoasters). Of course X will seem short comapred to those. But if you look at coasters through out history, 3,600 is far from being short.