What has been learned from hosting over three million internet sessions on trains - one of the world's largest hotspot? In 2004 the first fleet-wide commercial deployments of passenger internet was made by Swedish Railway's and Great North Easter Railways (UK). With millions of user sessions on the train internet access service, there has been a great success, showing the highest uptake numbers for any onboard service. What is the experience gained from this massive experience? What are the user preferences and how should internet services be designed to provide a positive business case for train operators? What are the technical requirements and how can technology be handled over time? What do user surveys indicate regarding other requirements and how should train operators reason when introducing a new service today? The paper aims to describe Icomera's unique experience with examples of both successes and failures.