Nice video. Do you know if there is any interconnecting linking to the Etihad rail from the metro. From the news sources here it is mentioned that connection to Saudi and Oman will be connected with the UAE, but I haven't seen any more details.
For Saudi Arabia, its section of the railway is the longest but not a priority as it passes through the sparsely populated east coast, and instead it is prioritizing linking Riyadh to Jeddah. It will eventually be built, but no official due date from Saudi Arabia.