Middle Eastern Trains

What is train travel like in the Middle East? I'm probably going to wash ashore in the region this summer, and am looking for ways to get from one area of it to another quickly and efficiently (relatively speaking, perhaps). If you know something about this, please e-mail or leave a note in the comments. (It occurs to me that since my main country could be Morocco, I might wind up hopping into either West Africa or Western Europe, instead.)