A rail mounted vehicle speed measuring device includes a first magnetic field generating member and a first magnetic field sensing member positioned at a first measuring location on the vehicle; a second magnetic field generating member and a second magnetic field sensing member posi
Method and device for control within a line network such as a tram line, of a number of rolling units in various line runnings, and a method for installation of said device. A number of passive position determination elements (9) such as transponders, arranged for radio scanning, are
