Rail decides which districts count as connected, and connected districts rent faster and hold value better. Every line below, open, in build or announced, with its stations, the communities within reach, and the honest read on what it does to prices.
How long the airport run actually takes is one of the few journeys buyers weigh directly against each other, and in Abu Dhabi it is the clearest difference between the mainland and the islands.
In every market that builds it, urban rail adds a measurable premium to homes within a short walk of a station, and the premium arrives before the trains do: announcement, then construction, then opening each move prices in turn. The UAE is mid-way through the biggest rail build-out in its history, which is why the in-build and announced lines above matter to buyers today, not in 2030.