JetStream is a concept of high speed network that allows the transmission of images for the applications of video supervision embarked in a train. This network is formed from three basic components: JET-TRANS which digitizes, compresses and transmits the images coming from the cameras, JET-STORE which stores the images on hard disk and JET-VIEW, the screen of visualization in real-time. The high speed WITAMIN radio interface allows adding functionalities such as loading and unloading of contents and video transmission real-time between the train and ground.