Techniques and systems for testing, evaluating and/or otherwise assessing the operation of vehicles are discussed herein. Aspects relate to a system and method comprising receiving vehicle data derived from a vehicle data logging system, the vehicle data being associated with a vehicle run and comprising a plurality of data topics associated with a corresponding plurality of vehicle components and displaying the vehicle data with a timeline component of a user interface during playback of the vehicle run, the timeline component comprising a portion in the user interface and the portion being configurable with a start time and an end time. The vehicle data may comprise timing data for at least one of the data topics and the vehicle data may be displayed at points in time along the portion in the user interface corresponding to the timing data.