The trolleys are designed for measurements of the track geometry components cant, level, alignment and gauge. The readings are recorded in real time and stored in an electronic memory as the trolley travels along the track. The operator can see the measured values on the display during the measurements. The large size foil keyboard makes it possible to enter information on track faults found. One can mark locations, e.g., of broken welds and rails, the need to replace sleepers, or missing bolts.