By using a Datron/OXTS RT3200 Vehicle Dynamics measuring system a full range of performance and ride parameters can be logged during a test run. Speed, acceleration and braking, plus roll, pitch and yaw parameters can be measured. This gives valuable feedback to design engineers involved in traction, braking and suspension systems design. The compact RT3200 can be fitted to a test vehicle in a matter of minutes. If an RT3200 is mounted in a powered rail vehicle and another in a non-powered, then a comparative study of the ride qualities of both can be made and the interactive effects studied.