Doha is one of the possible transferring cities when flying between Eastern World and Western World.
But, as a rail fan, I hesitate to choose Doha as the stopover city so far. Though the country has grown economically to be the developed country, there isn't any rail system. Now, Doha Metro is under construction. By the year of 2026, the system length will be expanded to 163.8 km.
Then, it's the chance to choose Doha as the intermediate destination.