Haramain High-Speed Railway, Saudi Arabia (2018)
Saudi Arabia opened the Haramain line in October 2018 after nearly a decade of delays and cost overruns. Trains run at 300 km/h over a 450-kilometre route between Mecca and Medina, with a stop in Jeddah.
It became the Gulf's first high-speed passenger railway.
It showed Gulf states can build modern intercity rail, while also demonstrating how easily schedules and budgets slip.
The UAE's fast rollout is the second Gulf passenger rail buildout, and Haramain's delays are a reminder of how ambitious rail timetables often slip.
