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In the UK MyRailLite were paying for train live departure data. You could look up if a train was delayed and which platform to go to.

When the app became successful National Rail pulled their feed and released their own more expensive and clunkier app iPhone instead.

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Which is a reason not to rely on such feeds without a fixed-price contract in place. I passed on an app idea where the feed provider could potentially release his own app and shut me off if/when my app becomes popular. The feed provider refused to enter into a contract, and still has not released his own app after 8 months - depriving himself and his users of the service. Pity.

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