Dev builds a Renfe train-tracking app in 3-4 hours using public GPS data and AI

IgorCarron · x · 2026-10-30

A developer wondered what it would cost to build an app monitoring Spain's Renfe trains — and discovered each train's GPS position is public data. Three to four hours later, the app was working. Igor Carron amplified it as another example of how fast individuals can now ship ideas with AI.

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