ixigo

India's go-to app for train PNR and running-status lookups, plus flight and bus booking — checked constantly by train travelers rather than installed and forgotten. ixigo's companion train-specific native app runs about 34MB; for a lookup someone runs a few times around a single journey, that's a real install to commit to. Open ixigo.com and add it to the home screen if you're a frequent train traveler.