Saudi Arabia’s capital marked a historic milestone this month with the launch of its first metro system - and it is already proving to be an instant success with 1.9 million passengers utilizing the transport link in the first week of operations.Riyadh Metro, which began operations on December 1, is a multi-billion-dollar project featureing six color-coded lines spanning 176 kilometers with 85 stations, and has 183 trains manufactured by industry leaders Siemens, Bombardier, and Alstom, establishing itself as the world’s longest driverless metro network.For all the latest headlines follow our Google News channel online or via the app.The metro is designed to carry 1.2 million passengers daily, with plans to scale up to 3.6 million, helping to ease traffic jams and reduce reliance on cars.On social networking site X, Riyadh Metro said of the 1.9 million passengers who hopped aboard in the first week, the Purple Line has proved to be the most popular so far.The Riyadh Metro transport