Singapore Rail is a fast, free app that keeps you up-to-date with the status of the MRT & LRT networks in Singapore.
Singapore Rail features detailed service unavailability information including affected stations, the affected direction of travel, and information on whether there are free public buses or MRT shuttles in operation.
Additionally, you can configure push notifications on a per-line basis, set Siri interactions and shortcuts on a per-line basis, and add a nicely designed today widget to Notification Centre.
Singapore Rail also includes a fantastic selection of custom icons covering MRT services that commenced between 2003 and 2013.
If you're really interested, you can also buy a Singapore Rail t-shirt from Cotton Bureau. (These can be purchased in app.)