Gulf states have agreed in principle to extend their multi-billion dollar railway project to Yemen, a UAE official said Saturday. The six countries in the Gulf Cooperation Council (GCC) - Saudi Arabia, the UAE, Kuwait, Qatar, Oman and Bahrain - are spending more than $100 billion on various rail projects to ease congestion in the face of poor public transport networks and a growing population. The Gulf Arab rail network alone will cost $20-$25 billion as the six oil producers seek to create a similar model to Europe's high speed rail system. The 1,940-km railway would connect the six Gulf States, each of which would contribute a share of the start-up capital. Yemen had asked for the railway to be extended over its border with Oman. “The GCC has accepted in principle to extend the railway link to Yemen from Oman,” said the official, who was attending a meeting of Gulf policymakers in Oman. Gulf officials also agreed to appoint a single authority for the rail project and approved its design.